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

third_party/WebKit/Source/core/page/ChromeClientTest.cpp

 // 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 "core/page/ChromeClient.h"
 
 #include "core/dom/Document.h"
 #include "core/layout/HitTestResult.h"
 #include "core/loader/EmptyClients.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 14 matching lines @@
   void ClearToolTipForLastSetToolTip() {
     tool_tip_for_last_set_tool_tip_ = String();
   }
 
  private:
   String tool_tip_for_last_set_tool_tip_;
 };
 
 }  // anonymous namespace
 
-class ChromeClientTest : public testing::Test {};
+class ChromeClientTest : public ::testing::Test {};
 
 TEST_F(ChromeClientTest, SetToolTipFlood) {
   ChromeClientToolTipLogger logger;
   ChromeClient* client = &logger;
   HitTestResult result(HitTestRequest(HitTestRequest::kMove),
                        LayoutPoint(10, 20));
   Document* doc = Document::Create();
   Element* element = HTMLElement::Create(HTMLNames::divTag, *doc);
   element->setAttribute(HTMLNames::titleAttr, "tooltip");
   result.SetInnerNode(element);
@@ skipping 16 matching lines @@
 
   logger.ClearToolTipForLastSetToolTip();
   element->setAttribute(HTMLNames::titleAttr, "updated");
   client->SetToolTip(*doc->GetFrame(), result);
   // setToolTip(String,TextDirection) should be called because tooltip string
   // is different from the last one.
   EXPECT_EQ("updated", logger.ToolTipForLastSetToolTip());
 }
 
 }  // namespace blink