Roll update to harfbuzz to 2.1.0 (#6760)

DEPS

@@ -138,7 +138,7 @@ deps = {
    Var('fuchsia_git') + '/third_party/rapidjson' + '@' + '32d07c55db1bb6c2ae17cba4033491a667647753',
 
   'src/third_party/harfbuzz':
-   Var('fuchsia_git') + '/third_party/harfbuzz' + '@' + 'd837034f09a957faf2814002e8ebd81da6151d1b',
+   Var('fuchsia_git') + '/third_party/harfbuzz' + '@' + '02caec6c1c6ad996666788b8e920ccaec8b385e5',
 
    # Chromium-style
    #

third_party/txt/src/minikin/Layout.cpp

@@ -170,20 +170,10 @@ class LayoutCache : private android::OnEntryRemoved<LayoutCacheKey, Layout*> {
   static const size_t kMaxEntries = 5000;
 };
 
-static unsigned int disabledDecomposeCompatibility(hb_unicode_funcs_t*,
-                                                   hb_codepoint_t,
-                                                   hb_codepoint_t*,
-                                                   void*) {
-  return 0;
-}
-
 class LayoutEngine {
  public:
   LayoutEngine() {
     unicodeFunctions = hb_unicode_funcs_create(hb_icu_get_unicode_funcs());
-    /* Disable the function used for compatibility decomposition */
-    hb_unicode_funcs_set_decompose_compatibility_func(
-        unicodeFunctions, disabledDecomposeCompatibility, NULL, NULL);
     hbBuffer = hb_buffer_create();
     hb_buffer_set_unicode_funcs(hbBuffer, unicodeFunctions);
   }