Fix unit test style in core/{dom,editing,html}/.

Source/core/html/canvas/CanvasRenderingContext2DTest.cpp

 // 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.
 
 #include "config.h"
-
 #include "core/html/canvas/CanvasRenderingContext2D.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/ImageBitmap.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/ImageData.h"
 #include "core/html/canvas/CanvasGradient.h"
 #include "core/html/canvas/CanvasPattern.h"
 #include "core/html/canvas/WebGLRenderingContext.h"
 #include "core/loader/EmptyClients.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/graphics/ExpensiveCanvasHeuristicParameters.h"
 #include "platform/graphics/RecordingImageBufferSurface.h"
 #include "platform/graphics/StaticBitmapImage.h"
 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
 #include "third_party/skia/include/core/SkSurface.h"
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 
-using namespace blink;
 using ::testing::Mock;
 
-namespace {
+namespace blink {
 
 enum BitmapOpacity {
     OpaqueBitmap,
     TransparentBitmap
 };
 
 class FakeImageSource : public CanvasImageSource {
 public:
     FakeImageSource(IntSize, BitmapOpacity);
 
@@ skipping 26 matching lines @@
     if (status)
         *status = NormalSourceImageStatus;
     return m_image;
 }
 
 //============================================================================
 
 class CanvasRenderingContext2DTest : public ::testing::Test {
 protected:
     CanvasRenderingContext2DTest();
-    virtual void SetUp() override;
+    void SetUp() override;
 
     DummyPageHolder& page() const { return *m_dummyPageHolder; }
     HTMLDocument& document() const { return *m_document; }
     HTMLCanvasElement& canvasElement() const { return *m_canvasElement; }
     CanvasRenderingContext2D* context2d() const { return static_cast<CanvasRenderingContext2D*>(canvasElement().renderingContext()); }
 
     void createContext(OpacityMode);
 
 private:
     OwnPtr<DummyPageHolder> m_dummyPageHolder;
@@ skipping 510 matching lines @@
 
     // The canvasChanged notification must be immediate, and not deferred until paint time
     // because offscreen canvases, which are not painted, also need to emit notifications.
     EXPECT_CALL(*observer, canvasChanged(&canvasElement(), FloatRect(0, 0, 1, 1))).Times(1);
     context2d()->fillRect(0, 0, 1, 1);
     Mock::VerifyAndClearExpectations(observer.get());
 
     canvasElement().removeObserver(observer.get());
 }
 
-} // unnamed namespace
+} // namespace blink