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

third_party/WebKit/Source/core/page/scrolling/RootScrollerTest.cpp

 // Copyright 2016 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 "bindings/core/v8/NodeOrString.h"
 #include "core/dom/ClientRect.h"
 #include "core/exported/WebRemoteFrameImpl.h"
 #include "core/frame/BrowserControls.h"
 #include "core/frame/FrameTestHelpers.h"
 #include "core/frame/LocalFrameView.h"
@@ skipping 18 matching lines @@
 #include "public/platform/WebCoalescedInputEvent.h"
 #include "public/platform/WebURLLoaderMockFactory.h"
 #include "public/web/WebConsoleMessage.h"
 #include "public/web/WebHitTestResult.h"
 #include "public/web/WebRemoteFrame.h"
 #include "public/web/WebScriptSource.h"
 #include "public/web/WebSettings.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using blink::testing::RunPendingTasks;
-using testing::Mock;
+using ::testing::Mock;
 
 namespace blink {
 
 namespace {
 
 class RootScrollerTest : public ::testing::Test,
                          public ::testing::WithParamInterface<bool>,
                          private ScopedRootLayerScrollingForTest {
  public:
   RootScrollerTest()
@@ skipping 1204 matching lines @@
   // Ensure the target and container weren't put into the same layer.
   ASSERT_NE(ToLayoutBox(target->GetLayoutObject())->EnclosingLayer(),
             ToLayoutBox(container->GetLayoutObject())->Layer());
 
   CheckHitTestAtBottomOfScreen();
 }
 
 }  // namespace
 
 }  // namespace blink