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

third_party/WebKit/Source/platform/graphics/gpu/SharedGpuContextTest.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 "platform/graphics/gpu/SharedGpuContext.h"
 
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "platform/graphics/test/FakeGLES2Interface.h"
 #include "platform/graphics/test/FakeWebGraphicsContext3DProvider.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/khronos/GLES2/gl2ext.h"
 
-using testing::Test;
+using ::testing::Test;
 
 namespace blink {
 
 namespace {
 
 class SharedGpuContextTest : public Test {
  public:
   void SetUp() override {
     SharedGpuContext::SetContextProviderFactoryForTesting([this] {
       gl_.SetIsContextLost(false);
@@ skipping 14 matching lines @@
   unsigned context_id = SharedGpuContext::ContextId();
   gl_.SetIsContextLost(true);
   EXPECT_FALSE(SharedGpuContext::IsValidWithoutRestoring());
   EXPECT_TRUE(SharedGpuContext::IsValid());
   EXPECT_NE(context_id, SharedGpuContext::ContextId());
 }
 
 }  // unnamed namespace
 
 }  // blink