Blink Plugins: Remove Shadow DOM Plugin Placeholder remnants.

Source/core/core_generated.gypi

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'includes': [
     '../bindings/core/core.gypi',  # for bindings_core_v8_output_dir
   ],
 
   'variables': {
     'blink_core_output_dir': '<(SHARED_INTERMEDIATE_DIR)/blink/core',
 
     'generated_webcore_testing_idl_files': [
       '<(blink_core_output_dir)/testing/InternalRuntimeFlags.idl',
       '<(blink_core_output_dir)/testing/InternalSettingsGenerated.idl',
     ],
 
     'generated_core_testing_dictionary_files': [
       '<(blink_core_output_dir)/testing/InternalDictionary.cpp',
       '<(blink_core_output_dir)/testing/InternalDictionary.h',
       '<(blink_core_output_dir)/testing/InternalDictionaryDerived.cpp',
       '<(blink_core_output_dir)/testing/InternalDictionaryDerived.h',
-      '<(blink_core_output_dir)/testing/PluginPlaceholderOptions.cpp',
-      '<(blink_core_output_dir)/testing/PluginPlaceholderOptions.h',
     ],
 
     'generated_bindings_core_testing_files': [
       '<(bindings_core_v8_output_dir)/V8DictionaryTest.cpp',
       '<(bindings_core_v8_output_dir)/V8DictionaryTest.h',
       '<(bindings_core_v8_output_dir)/V8GarbageCollectedScriptWrappable.cpp',
       '<(bindings_core_v8_output_dir)/V8GarbageCollectedScriptWrappable.h',
       '<(bindings_core_v8_output_dir)/V8GCObservation.cpp',
       '<(bindings_core_v8_output_dir)/V8GCObservation.h',
       '<(bindings_core_v8_output_dir)/V8PrivateScriptTest.cpp',
@@ skipping 13 matching lines @@
       '<(bindings_core_v8_output_dir)/V8LayerRect.cpp',
       '<(bindings_core_v8_output_dir)/V8LayerRect.h',
       '<(bindings_core_v8_output_dir)/V8LayerRectList.cpp',
       '<(bindings_core_v8_output_dir)/V8LayerRectList.h',
       '<(bindings_core_v8_output_dir)/V8RefCountedScriptWrappable.cpp',
       '<(bindings_core_v8_output_dir)/V8RefCountedScriptWrappable.h',
       '<(bindings_core_v8_output_dir)/V8InternalDictionary.cpp',
       '<(bindings_core_v8_output_dir)/V8InternalDictionary.h',
       '<(bindings_core_v8_output_dir)/V8InternalDictionaryDerived.cpp',
       '<(bindings_core_v8_output_dir)/V8InternalDictionaryDerived.h',
-      '<(bindings_core_v8_output_dir)/V8PluginPlaceholderOptions.cpp',
-      '<(bindings_core_v8_output_dir)/V8PluginPlaceholderOptions.h',
     ],
 
     'generated_core_additional_files': [
       # Additional .cpp files for HashTools.h
       '<(blink_core_output_dir)/CSSPropertyNames.cpp',
       '<(blink_core_output_dir)/CSSValueKeywords.cpp',
 
       # Additional .cpp files from make_core_generated actions.
       '<(blink_core_output_dir)/Event.cpp',
       '<(blink_core_output_dir)/EventHeaders.h',
@@ skipping 52 matching lines @@
 
       # Generated from make_style_builder.py
       '<(blink_core_output_dir)/StyleBuilder.cpp',
       '<(blink_core_output_dir)/StyleBuilderFunctions.cpp',
 
       # Generated from make_css_property_metadata.py
       '<(blink_core_output_dir)/CSSPropertyMetadata.cpp',
     ],
   },
 }