Be explicit about namespace testing to not mix it with blink::testing

third_party/WebKit/Source/platform/graphics/paint/PaintControllerTest.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 "platform/graphics/paint/PaintController.h"
 
 #include <memory>
 #include "build/build_config.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/paint/ClipPathDisplayItem.h"
 #include "platform/graphics/paint/ClipPathRecorder.h"
 #include "platform/graphics/paint/ClipRecorder.h"
 #include "platform/graphics/paint/CompositingRecorder.h"
 #include "platform/graphics/paint/DrawingDisplayItem.h"
 #include "platform/graphics/paint/DrawingRecorder.h"
 #include "platform/graphics/paint/SubsequenceRecorder.h"
 #include "platform/testing/FakeDisplayItemClient.h"
 #include "platform/testing/PaintPropertyTestHelpers.h"
 #include "platform/testing/RuntimeEnabledFeaturesTestHelpers.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using blink::testing::CreateOpacityOnlyEffect;
 using blink::testing::DefaultPaintChunkProperties;
-using testing::UnorderedElementsAre;
+using ::testing::UnorderedElementsAre;
 
 namespace blink {
 
 class PaintControllerTestBase : public ::testing::Test {
  public:
   PaintControllerTestBase() : paint_controller_(PaintController::Create()) {}
 
  protected:
   PaintController& GetPaintController() { return *paint_controller_; }
 
@@ skipping 2282 matching lines @@
 TEST_F(PaintControllerUnderInvalidationTest, InvalidationInSubsequence) {
   // We allow invalidated display item clients as long as they would produce the
   // same display items. The cases of changed display items are tested by other
   // test cases.
   TestInvalidationInSubsequence();
 }
 
 #endif  // defined(GTEST_HAS_DEATH_TEST) && !defined(OS_ANDROID)
 
 }  // namespace blink