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

third_party/WebKit/Source/core/layout/ScrollAnchorTest.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/layout/ScrollAnchor.h"
 
 #include "core/dom/ClientRect.h"
 #include "core/frame/VisualViewport.h"
 #include "core/layout/LayoutBox.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/page/PrintContext.h"
 #include "core/paint/PaintLayerScrollableArea.h"
 #include "platform/testing/HistogramTester.h"
 #include "platform/testing/RuntimeEnabledFeaturesTestHelpers.h"
 
 namespace blink {
 
 using Corner = ScrollAnchor::Corner;
 
 typedef bool TestParamRootLayerScrolling;
 class ScrollAnchorTest
-    : public testing::WithParamInterface<TestParamRootLayerScrolling>,
+    : public ::testing::WithParamInterface<TestParamRootLayerScrolling>,
       private ScopedRootLayerScrollingForTest,
       public RenderingTest {
  public:
   ScrollAnchorTest() : ScopedRootLayerScrollingForTest(GetParam()) {
     RuntimeEnabledFeatures::SetScrollAnchoringEnabled(true);
   }
   ~ScrollAnchorTest() {
     RuntimeEnabledFeatures::SetScrollAnchoringEnabled(false);
   }
 
@@ skipping 413 matching lines @@
   ScrollLayoutViewport(ScrollOffset(0, 150));
 
   // This will trigger printing and layout.
   PrintContext::NumberOfPages(GetDocument().GetFrame(), FloatSize(500, 500));
 
   EXPECT_EQ(150, viewport->ScrollOffsetInt().Height());
   EXPECT_EQ(nullptr, GetScrollAnchor(viewport).AnchorObject());
 }
 
 }