Remove part of DemoUtil from demo app

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=183056883

demos/main/src/main/java/com/google/android/exoplayer2/demo/DemoUtil.java

@@ -16,44 +16,15 @@
 package com.google.android.exoplayer2.demo;
 
 import android.text.TextUtils;
-import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Format;
-import com.google.android.exoplayer2.drm.UnsupportedDrmException;
 import com.google.android.exoplayer2.util.MimeTypes;
-import com.google.android.exoplayer2.util.Util;
 import java.util.Locale;
-import java.util.UUID;
 
 /**
  * Utility methods for demo application.
  */
 /* package */ final class DemoUtil {
 
-  /**
-   * Derives a DRM {@link UUID} from {@code drmScheme}.
-   *
-   * @param drmScheme A protection scheme UUID string; or {@code "widevine"}, {@code "playready"} or
-   *     {@code "clearkey"}.
-   * @return The derived {@link UUID}.
-   * @throws UnsupportedDrmException If no {@link UUID} could be derived from {@code drmScheme}.
-   */
-  public static UUID getDrmUuid(String drmScheme) throws UnsupportedDrmException {
-    switch (Util.toLowerInvariant(drmScheme)) {
-      case "widevine":
-        return C.WIDEVINE_UUID;
-      case "playready":
-        return C.PLAYREADY_UUID;
-      case "clearkey":
-        return C.CLEARKEY_UUID;
-      default:
-        try {
-          return UUID.fromString(drmScheme);
-        } catch (RuntimeException e) {
-          throw new UnsupportedDrmException(UnsupportedDrmException.REASON_UNSUPPORTED_SCHEME);
-        }
-    }
-  }
-
   /**
    * Builds a track name for display.
    *

demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java

@@ -275,9 +275,14 @@ public class PlayerActivity extends Activity
           try {
             String drmSchemeExtra = intent.hasExtra(DRM_SCHEME_EXTRA) ? DRM_SCHEME_EXTRA
                 : DRM_SCHEME_UUID_EXTRA;
-            UUID drmSchemeUuid = DemoUtil.getDrmUuid(intent.getStringExtra(drmSchemeExtra));
-            drmSessionManager = buildDrmSessionManagerV18(drmSchemeUuid, drmLicenseUrl,
-                keyRequestPropertiesArray, multiSession);
+            UUID drmSchemeUuid = Util.getDrmUuid(intent.getStringExtra(drmSchemeExtra));
+            if (drmSchemeUuid == null) {
+              errorStringId = R.string.error_drm_unsupported_scheme;
+            } else {
+              drmSessionManager =
+                  buildDrmSessionManagerV18(
+                      drmSchemeUuid, drmLicenseUrl, keyRequestPropertiesArray, multiSession);
+            }
           } catch (UnsupportedDrmException e) {
             errorStringId = e.reason == UnsupportedDrmException.REASON_UNSUPPORTED_SCHEME
                 ? R.string.error_drm_unsupported_scheme : R.string.error_drm_unknown;

demos/main/src/main/java/com/google/android/exoplayer2/demo/SampleChooserActivity.java

@@ -33,7 +33,6 @@ import android.widget.ExpandableListView.OnChildClickListener;
 import android.widget.TextView;
 import android.widget.Toast;
 import com.google.android.exoplayer2.ParserException;
-import com.google.android.exoplayer2.drm.UnsupportedDrmException;
 import com.google.android.exoplayer2.upstream.DataSource;
 import com.google.android.exoplayer2.upstream.DataSourceInputStream;
 import com.google.android.exoplayer2.upstream.DataSpec;
@@ -202,11 +201,9 @@ public class SampleChooserActivity extends Activity {
             break;
           case "drm_scheme":
             Assertions.checkState(!insidePlaylist, "Invalid attribute on nested item: drm_scheme");
-            try {
-              drmUuid = DemoUtil.getDrmUuid(reader.nextString());
-            } catch (UnsupportedDrmException e) {
-              throw new ParserException(e);
-            }
+            String drmScheme = reader.nextString();
+            drmUuid = Util.getDrmUuid(drmScheme);
+            Assertions.checkState(drmUuid != null, "Invalid drm_scheme: " + drmScheme);
             break;
           case "drm_license_url":
             Assertions.checkState(!insidePlaylist,

library/core/src/main/java/com/google/android/exoplayer2/util/Util.java

@@ -53,6 +53,7 @@ import java.util.List;
 import java.util.Locale;
 import java.util.MissingResourceException;
 import java.util.TimeZone;
+import java.util.UUID;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ThreadFactory;
@@ -1044,6 +1045,30 @@ public final class Util {
     }
   }
 
+  /**
+   * Derives a DRM {@link UUID} from {@code drmScheme}.
+   *
+   * @param drmScheme A UUID string, or {@code "widevine"}, {@code "playready"} or {@code
+   *     "clearkey"}.
+   * @return The derived {@link UUID}, or {@code null} if one could not be derived.
+   */
+  public static UUID getDrmUuid(String drmScheme) {
+    switch (Util.toLowerInvariant(drmScheme)) {
+      case "widevine":
+        return C.WIDEVINE_UUID;
+      case "playready":
+        return C.PLAYREADY_UUID;
+      case "clearkey":
+        return C.CLEARKEY_UUID;
+      default:
+        try {
+          return UUID.fromString(drmScheme);
+        } catch (RuntimeException e) {
+          return null;
+        }
+    }
+  }
+
   /**
    * Makes a best guess to infer the type from a {@link Uri}.
    *