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

third_party/WebKit/Source/core/css/parser/CSSLazyParsingTest.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/css/CSSStyleSheet.h"
 #include "core/css/StyleRule.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/parser/CSSLazyParsingState.h"
 #include "core/css/parser/CSSParser.h"
 #include "core/css/parser/CSSParserContext.h"
 #include "core/page/Page.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/heap/Heap.h"
 #include "platform/testing/HistogramTester.h"
 #include "platform/wtf/text/WTFString.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
-class CSSLazyParsingTest : public testing::Test {
+class CSSLazyParsingTest : public ::testing::Test {
  public:
   bool HasParsedProperties(StyleRule* rule) {
     return rule->HasParsedProperties();
   }
 
   StyleRule* RuleAt(StyleSheetContents* sheet, size_t index) {
     return ToStyleRule(sheet->ChildRules()[index]);
   }
 
  protected:
@@ skipping 205 matching lines @@
   histogram_tester_.ExpectBucketCount(usage_metric,
                                       CSSLazyParsingState::kUsageGt90, 1);
   histogram_tester_.ExpectBucketCount(usage_metric,
                                       CSSLazyParsingState::kUsageAll, 1);
 
   histogram_tester_.ExpectTotalCount(total_rules_full_usage_metric, 1);
   histogram_tester_.ExpectUniqueSample(total_rules_full_usage_metric, 5, 1);
 }
 
 }  // namespace blink