Remove TraceReferences exceptions for ink proto extensions

Bug: 1146511
Change-Id: Id1292c666d258a7d4bb38cd56cff7f33badba58f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596141
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838142}

build/android/gyp/proguard.py

@@ -411,12 +411,6 @@ def _CheckForMissingSymbols(r8_path,
         # TODO(crbug.com/1142530): Fix this missing reference properly.
         'org/chromium/base/library_loader/NativeLibraries',
 
-        # Currently required when enable_chrome_android_internal=true.
-        'com/google/protos/research/ink/InkEventProto',
-        'ink_sdk/com/google/protobuf/Internal$EnumVerifier',
-        'ink_sdk/com/google/protobuf/MessageLite',
-        'com/google/protobuf/GeneratedMessageLite$GeneratedExtension',
-
         # TODO(agrieve): Exclude these only when use_jacoco_coverage=true.
         'Ljava/lang/instrument/ClassFileTransformer',
         'Ljava/lang/instrument/IllegalClassFormatException',