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

third_party/WebKit/Source/platform/scheduler/renderer/render_widget_signals_unittest.cc

 // Copyright 2015 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/scheduler/renderer/render_widget_signals.h"
 
 #include "base/macros.h"
 #include "public/platform/scheduler/renderer/render_widget_scheduling_state.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using testing::AnyNumber;
-using testing::Mock;
-using testing::_;
+using ::testing::AnyNumber;
+using ::testing::Mock;
+using ::testing::_;
 
 namespace blink {
 namespace scheduler {
 
 namespace {
 class MockObserver : public RenderWidgetSignals::Observer {
  public:
   MockObserver() {}
   virtual ~MockObserver() {}
 
   MOCK_METHOD1(SetAllRenderWidgetsHidden, void(bool hidden));
   MOCK_METHOD1(SetHasVisibleRenderWidgetWithTouchHandler,
                void(bool has_visible_render_widget_with_touch_handler));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockObserver);
 };
 }
 
-class RenderWidgetSignalsTest : public testing::Test {
+class RenderWidgetSignalsTest : public ::testing::Test {
  public:
   RenderWidgetSignalsTest() {}
   ~RenderWidgetSignalsTest() override {}
 
   void SetUp() override {
     mock_observer_.reset(new MockObserver());
     render_widget_signals_.reset(new RenderWidgetSignals(mock_observer_.get()));
   }
 
   void IgnoreWidgetCreationCallbacks() {
@@ skipping 214 matching lines @@
   widget_state->SetHidden(true);
   Mock::VerifyAndClearExpectations(mock_observer_.get());
 
   EXPECT_CALL(*mock_observer_, SetHasVisibleRenderWidgetWithTouchHandler(_))
       .Times(0);
   IgnoreWidgetDestructionCallbacks();
 }
 
 }  // namespace scheduler
 }  // namespace blink