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

third_party/WebKit/Source/core/layout/MapCoordinatesTest.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/layout/LayoutInline.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/LayoutView.h"
 #include "platform/geometry/TransformState.h"
 #include "platform/testing/RuntimeEnabledFeaturesTestHelpers.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 typedef bool TestParamRootLayerScrolling;
 class MapCoordinatesTest
-    : public testing::WithParamInterface<TestParamRootLayerScrolling>,
+    : public ::testing::WithParamInterface<TestParamRootLayerScrolling>,
       private ScopedRootLayerScrollingForTest,
       public RenderingTest {
  public:
   MapCoordinatesTest()
       : ScopedRootLayerScrollingForTest(GetParam()),
         RenderingTest(SingleChildLocalFrameClient::Create()) {}
   FloatPoint MapLocalToAncestor(const LayoutObject*,
                                 const LayoutBoxModelObject* ancestor,
                                 FloatPoint,
                                 MapCoordinatesFlags = 0) const;
@@ skipping 1627 matching lines @@
               LayoutUnit::Epsilon());
   EXPECT_NEAR(50.0, matrix.ProjectPoint(FloatPoint(100.0, 50.0)).Y(),
               LayoutUnit::Epsilon());
   EXPECT_NEAR(25.0, matrix.ProjectPoint(FloatPoint(50.0, 100.0)).X(),
               LayoutUnit::Epsilon());
   EXPECT_NEAR(100.0, matrix.ProjectPoint(FloatPoint(50.0, 100.0)).Y(),
               LayoutUnit::Epsilon());
 }
 
 }  // namespace blink