Remove IME API from Blink

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 252 matching lines @@
             'html/canvas/WebGLRenderingContext.idl',
             'html/canvas/WebGLSampler.idl',
             'html/canvas/WebGLShader.idl',
             'html/canvas/WebGLShaderPrecisionFormat.idl',
             'html/canvas/WebGLSync.idl',
             'html/canvas/WebGLTexture.idl',
             'html/canvas/WebGLTransformFeedback.idl',
             'html/canvas/WebGLUniformLocation.idl',
             'html/canvas/WebGLVertexArrayObject.idl',
             'html/canvas/WebGLVertexArrayObjectOES.idl',
-            'html/ime/InputMethodContext.idl',
             'html/shadow/PluginPlaceholderElement.idl',
             'html/track/AudioTrack.idl',
             'html/track/AudioTrackList.idl',
             'html/track/TextTrack.idl',
             'html/track/TextTrackCue.idl',
             'html/track/TextTrackCueList.idl',
             'html/track/TextTrackList.idl',
             'html/track/TrackEvent.idl',
             'html/track/VideoTrack.idl',
             'html/track/VideoTrackList.idl',
@@ skipping 2690 matching lines @@
             'html/forms/TextInputType.cpp',
             'html/forms/TextInputType.h',
             'html/forms/TimeInputType.cpp',
             'html/forms/TimeInputType.h',
             'html/forms/TypeAhead.cpp',
             'html/forms/TypeAhead.h',
             'html/forms/URLInputType.cpp',
             'html/forms/URLInputType.h',
             'html/forms/WeekInputType.cpp',
             'html/forms/WeekInputType.h',
-            'html/ime/InputMethodContext.cpp',
-            'html/ime/InputMethodContext.h',
             'html/imports/HTMLImport.cpp',
             'html/imports/HTMLImport.h',
             'html/imports/HTMLImportChild.cpp',
             'html/imports/HTMLImportChild.h',
             'html/imports/HTMLImportChildClient.h',
             'html/imports/HTMLImportLoader.cpp',
             'html/imports/HTMLImportLoader.h',
             'html/imports/HTMLImportState.h',
             'html/imports/HTMLImportStateResolver.cpp',
             'html/imports/HTMLImportStateResolver.h',
@@ skipping 921 matching lines @@
             'style/ComputedStyleTest.cpp',
             'style/OutlineValueTest.cpp',
             'style/SVGComputedStyleTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }