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

third_party/WebKit/Source/platform/graphics/filters/ImageFilterBuilderTest.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 13 matching lines @@
 
 #include "SkImageFilter.h"
 #include "platform/graphics/filters/FEBlend.h"
 #include "platform/graphics/filters/FEGaussianBlur.h"
 #include "platform/graphics/filters/FEMerge.h"
 #include "platform/graphics/filters/Filter.h"
 #include "platform/graphics/filters/SkiaImageFilterBuilder.h"
 #include "platform/graphics/filters/SourceGraphic.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using testing::Test;
+using ::testing::Test;
 
 namespace blink {
 
 class ImageFilterBuilderTest : public Test {
  protected:
   void InterpolationSpaceTest() {
     // Build filter tree
     Filter* reference_filter = Filter::Create(1.0f);
 
     // Add a dummy source graphic input
@@ skipping 65 matching lines @@
     EXPECT_EQ(child->asColorFilter(0), true);
     EXPECT_EQ(child->countInputs(), 1);
   }
 };
 
 TEST_F(ImageFilterBuilderTest, testInterpolationSpace) {
   InterpolationSpaceTest();
 }
 
 }  // namespace blink