Remove a number of unused features from WebViewImpl

sky/engine/platform/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//sky/engine/build/scripts/scripts.gni")
 import("//sky/engine/config.gni")
 import("//testing/test.gni")
 
 # Most targets in this file are private actions so use that as the default.
@@ skipping 104 matching lines @@
     "DateComponents.h",
     "Decimal.cpp",
     "Decimal.h",
     "EventDispatchForbiddenScope.h",
     "EventTracer.cpp",
     "EventTracer.h",
     "exported/linux/WebFontInfo.cpp",
     "exported/linux/WebFontRenderStyle.cpp",
     "exported/Platform.cpp",
     "exported/ServiceProvider.cpp",
-    "exported/WebActiveGestureAnimation.cpp",
-    "exported/WebActiveGestureAnimation.h",
     "exported/WebArrayBuffer.cpp",
     "exported/WebCommon.cpp",
     "exported/WebConvertableToTraceFormat.cpp",
     "exported/WebCString.cpp",
     "exported/WebCursorInfo.cpp",
     "exported/WebData.cpp",
     "exported/WebFilterKeyframe.cpp",
     "exported/WebHTTPBody.cpp",
     "exported/WebHTTPLoadInfo.cpp",
     "exported/WebImageSkia.cpp",
@@ skipping 630 matching lines @@
     # See https://bugs.webkit.org/show_bug.cgi?id=62916.
     # TODO(GYP)
     #'cflags': ['-marm'],
     #    'conditions': [
     #      ['OS=="android"', {
     #        'cflags!': ['-mthumb'],
     #      }],
     #    ],
   }
 }