Replace generic Dictionary with DictionaryPluginPlaceholderOptions

Source/core/core.gypi

 {
     'includes': [
       'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/Animation.idl',
             'animation/AnimationEffect.idl',
             'animation/AnimationNode.idl',
@@ skipping 3430 matching lines @@
           '<(blink_core_output_dir)/dom/MutationObserverInit.h',
           '<(blink_core_output_dir)/frame/ScrollOptions.cpp',
           '<(blink_core_output_dir)/frame/ScrollOptions.h',
           '<(blink_core_output_dir)/html/canvas/HitRegionOptions.cpp',
           '<(blink_core_output_dir)/html/canvas/HitRegionOptions.h',
           '<(blink_core_output_dir)/page/EventSourceInit.cpp',
           '<(blink_core_output_dir)/page/EventSourceInit.h',
         ],
         'core_testing_dictionary_idl_files': [
           'testing/InternalDictionary.idl',
+          'testing/PluginPlaceholderOptions.idl',
         ],
         'webcore_testing_idl_files': [
           'testing/DictionaryTest.idl',
           'testing/GarbageCollectedScriptWrappable.idl',
           'testing/GCObservation.idl',
           'testing/InternalProfilers.idl',
           'testing/InternalSettings.idl',
           'testing/LayerRect.idl',
           'testing/LayerRectList.idl',
           'testing/PrivateScriptTest.idl',
           'testing/RefCountedScriptWrappable.idl',
           'testing/TypeConversions.idl',
           'testing/UnionTypesTest.idl',
         ],
         # testing IDL files that have partial interfaces in modules.
         'webcore_testing_idl_with_modules_dependency_files': [
           'testing/Internals.idl',
         ],
         'webcore_testing_dependency_idl_files': [
           'testing/PartialPrivateScriptTest.idl',
         ],
         'generated_webcore_testing_idl_files': [
           '<(blink_core_output_dir)/InternalRuntimeFlags.idl',
           '<(blink_core_output_dir)/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/PluginPlaceholderOptions.cpp',
+          '<(blink_core_output_dir)/testing/PluginPlaceholderOptions.h',
         ],
         'webcore_testing_files': [
             '<(blink_core_output_dir)/InternalSettingsGenerated.cpp',
             '<(blink_core_output_dir)/InternalSettingsGenerated.h',
             'testing/DictionaryTest.cpp',
             'testing/DictionaryTest.h',
             'testing/DummyPageHolder.cpp',
             'testing/DummyPageHolder.h',
             'testing/GarbageCollectedScriptWrappable.cpp',
             'testing/GarbageCollectedScriptWrappable.h',
@@ skipping 132 matching lines @@
             'rendering/style/OutlineValueTest.cpp',
             'rendering/style/RenderStyleTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'streams/ReadableStreamTest.cpp',
             'testing/UnitTestHelpers.cpp',
             'testing/UnitTestHelpers.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }