Fix cpplint errors in cc/(animation|input|layers|trees|test)/

cc/layers/content_layer_unittest.cc

 // Copyright 2012 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.
 
 #include "cc/layers/content_layer.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/resources/bitmap_content_layer_updater.h"
 #include "cc/test/geometry_test_utils.h"
 #include "skia/ext/platform_canvas.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/rect_conversions.h"
 
-using namespace WebKit;
-
 namespace cc {
 namespace {
 
 class MockContentLayerClient : public ContentLayerClient {
  public:
   explicit MockContentLayerClient(gfx::Rect opaque_layer_rect)
       : opaque_layer_rect_(opaque_layer_rect) {}
 
   virtual void PaintContents(SkCanvas* canvas,
                              gfx::Rect clip,
@@ skipping 24 matching lines @@
                            contents_scale,
                            &resulting_opaque_rect,
                            NULL);
 
   EXPECT_RECT_EQ(gfx::ToEnclosingRect(opaque_rect_in_content_space),
                  resulting_opaque_rect);
 }
 
 }  // namespace
 }  // namespace cc