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

third_party/WebKit/Source/modules/csspaint/PaintWorkletTest.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 "modules/csspaint/PaintWorklet.h"
 
 #include <memory>
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "bindings/core/v8/V8GCController.h"
 #include "bindings/core/v8/WorkerOrWorkletScriptController.h"
 #include "core/frame/LocalFrame.h"
 #include "core/testing/DummyPageHolder.h"
 #include "modules/csspaint/CSSPaintDefinition.h"
 #include "modules/csspaint/PaintWorkletGlobalScope.h"
 #include "modules/csspaint/PaintWorkletGlobalScopeProxy.h"
 #include "modules/csspaint/WindowPaintWorklet.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
-class PaintWorkletTest : public testing::Test {
+class PaintWorkletTest : public ::testing::Test {
  public:
   PaintWorkletTest() : page_(DummyPageHolder::Create()) {}
 
   void SetUp() override { proxy_ = GetPaintWorklet()->CreateGlobalScope(); }
 
   PaintWorklet* GetPaintWorklet() {
     return WindowPaintWorklet::From(*page_->GetFrame().DomWindow())
         .paintWorklet();
   }
 
@@ skipping 42 matching lines @@
   // Delete the page & associated objects.
   Terminate();
 
   // Run a GC, the persistent should have been collected.
   ThreadState::Current()->CollectAllGarbage();
   V8GCController::CollectAllGarbageForTesting(isolate);
   DCHECK(handle.IsEmpty());
 }
 
 }  // namespace blink