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

third_party/WebKit/Source/core/paint/FirstMeaningfulPaintDetectorTest.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 "core/paint/FirstMeaningfulPaintDetector.h"
 
 #include "core/paint/PaintTiming.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/testing/TestingPlatformSupport.h"
 #include "platform/wtf/text/StringBuilder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
-class FirstMeaningfulPaintDetectorTest : public testing::Test {
+class FirstMeaningfulPaintDetectorTest : public ::testing::Test {
  protected:
   void SetUp() override {
     platform_->AdvanceClockSeconds(1);
     dummy_page_holder_ = DummyPageHolder::Create(IntSize(800, 600));
   }
 
   double AdvanceClockAndGetTime() {
     platform_->AdvanceClockSeconds(1);
     return MonotonicallyIncreasingTime();
   }
@@ skipping 236 matching lines @@
 
 TEST_F(FirstMeaningfulPaintDetectorTest, UserInteractionBeforeFirstPaint) {
   SimulateUserInput();
   GetPaintTiming().MarkFirstContentfulPaint();
   SimulateLayoutAndPaint(10);
   SimulateNetworkStable();
   EXPECT_NE(GetPaintTiming().FirstMeaningfulPaint(), 0.0);
 }
 
 }  // namespace blink