Remove unused assets used for the defunct GN build of the iOS runner

sky/shell/BUILD.gn

@@ -334,7 +334,6 @@ if (is_android) {
     resource_copy_mac("sky_resources") {
       resources = [
         "//third_party/icu/android/icudtl.dat",
-        "platform/ios/LaunchScreen.storyboardc"
       ]
       bundle_directory = "."
     }

sky/shell/platform/ios/Info.plist

-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>en</string>
-
-	<!--
-		This executable name must match the name of the app provided to the
-		ios_app GN template
-	-->
-	<key>CFBundleExecutable</key>
-	<string>SkyShell</string>
-
-	<key>CFBundleIdentifier</key>
-	<string>com.google.SkyShell</string>
-
-	<key>UILaunchStoryboardName</key>
-	<string>LaunchScreen</string>
-
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>Sky</string>
-	<key>CFBundlePackageType</key>
-	<string>APPL</string>
-	<key>CFBundleShortVersionString</key>
-	<string>1.0</string>
-	<key>CFBundleVersion</key>
-	<string>1</string>
-	<key>LSRequiresIPhoneOS</key>
-	<true/>
-	<key>UIRequiredDeviceCapabilities</key>
-	<array>
-		<string>armv7</string>
-	</array>
-
-	<key>UIViewControllerBasedStatusBarAppearance</key>
-	<false />
-
-	<!--
-		FIXME(csg): Xcode, as part of its build process, adds the following
-		items to the Info.plist. It is not immediately clear if there is a
-		command line utility that generates these. For now, just add the same
-		manually
-	-->
-	<key>DTPlatformName</key>
-	<string>iphonesimulator</string>
-	<key>DTSDKName</key>
-	<string>iphonesimulator8.3</string>
-	<key>LSRequiresIPhoneOS</key>
-	<true/>
-	<key>MinimumOSVersion</key>
-	<string>8.3</string>
-	<key>UIDeviceFamily</key>
-	<array>
-		<integer>1</integer>
-		<integer>2</integer>
-	</array>
-	<key>CFBundleSupportedPlatforms</key>
-	<array>
-		<string>iPhoneSimulator</string>
-	</array>
-</dict>
-</plist>