Remove sky/engine/platform/clipboard

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 147 matching lines @@
     "Widget.cpp",
     "Widget.h",
     "WindowsKeyboardCodes.h",
     "animation/AnimationUtilities.h",
     "animation/AnimationValue.h",
     "animation/KeyframeValueList.cpp",
     "animation/KeyframeValueList.h",
     "animation/TimingFunction.cpp",
     "animation/TimingFunction.h",
     "animation/UnitBezier.h",
-    "clipboard/ClipboardMimeTypes.cpp",
-    "clipboard/ClipboardMimeTypes.h",
-    "clipboard/ClipboardUtilities.cpp",
-    "clipboard/ClipboardUtilities.h",
-    "clipboard/ClipboardUtilitiesPosix.cpp",
     "exported/Platform.cpp",
     "exported/ServiceProvider.cpp",
     "exported/WebArrayBuffer.cpp",
     "exported/WebCString.cpp",
     "exported/WebCommon.cpp",
     "exported/WebData.cpp",
     "exported/WebHTTPBody.cpp",
     "exported/WebHTTPLoadInfo.cpp",
     "exported/WebImageSkia.cpp",
     "exported/WebString.cpp",
@@ skipping 469 matching lines @@
     "ClockTest.cpp",
     "DecimalTest.cpp",
     "LayoutUnitTest.cpp",
     "LifecycleContextTest.cpp",
     "PurgeableVectorTest.cpp",
     "SharedBufferTest.cpp",
     "TestingPlatformSupport.cpp",
     "TestingPlatformSupport.h",
     "animation/TimingFunctionTest.cpp",
     "animation/UnitBezierTest.cpp",
-    "clipboard/ClipboardUtilitiesTest.cpp",
     "fonts/FontCacheTest.cpp",
     "fonts/FontDescriptionTest.cpp",
     "fonts/FontTest.cpp",
     "fonts/GlyphPageTreeNodeTest.cpp",
     "fonts/android/FontCacheAndroidTest.cpp",
     "geometry/FloatBoxTest.cpp",
     "geometry/FloatBoxTestHelpers.cpp",
     "geometry/FloatRoundedRectTest.cpp",
     "geometry/RegionTest.cpp",
     "geometry/RoundedRectTest.cpp",
@@ skipping 53 matching lines @@
     # See https://bugs.webkit.org/show_bug.cgi?id=62916.
     # TODO(GYP)
     #'cflags': ['-marm'],
     #    'conditions': [
     #      ['OS=="android"', {
     #        'cflags!': ['-mthumb'],
     #      }],
     #    ],
   }
 }