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

third_party/WebKit/Source/platform/fonts/SymbolsIteratorTest.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 "platform/fonts/SymbolsIterator.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include <string>
 
 namespace blink {
 
 struct TestRun {
   std::string text;
   FontFallbackPriority font_fallback_priority;
 };
 
 struct ExpectedRun {
   unsigned limit;
   FontFallbackPriority font_fallback_priority;
 
   ExpectedRun(unsigned the_limit,
               FontFallbackPriority the_font_fallback_priority)
       : limit(the_limit), font_fallback_priority(the_font_fallback_priority) {}
 };
 
-class SymbolsIteratorTest : public testing::Test {
+class SymbolsIteratorTest : public ::testing::Test {
  protected:
   void CheckRuns(const Vector<TestRun>& runs) {
     String text(g_empty_string16_bit);
     Vector<ExpectedRun> expect;
     for (auto& run : runs) {
       text.append(String::FromUTF8(run.text.c_str()));
       expect.push_back(ExpectedRun(text.length(), run.font_fallback_priority));
     }
     SymbolsIterator symbols_iterator(text.Characters16(), text.length());
     VerifyRuns(&symbols_iterator, expect);
@@ skipping 324 matching lines @@
         "\xF0\x9F\xA7\xA2\xF0\x9F\xA6\x93\xF0\x9F\xA6\x92\xF0\x9F\xA6\x94\xF0"
         "\x9F\xA6\x95\xF0\x9F\xA6\x96\xF0\x9F\xA6\x97\xF0\x9F\xA5\xA5\xF0\x9F"
         "\xA5\xA6\xF0\x9F\xA5\xA8\xF0\x9F\xA5\xA9\xF0\x9F\xA5\xAA\xF0\x9F\xA5"
         "\xA3\xF0\x9F\xA5\xAB\xF0\x9F\xA5\x9F\xF0\x9F\xA5\xA0\xF0\x9F\xA5\xA1"
         "\xF0\x9F\xA5\xA7\xF0\x9F\xA5\xA4\xF0\x9F\xA5\xA2\xF0\x9F\x9B\xB8\xF0"
         "\x9F\x9B\xB7\xF0\x9F\xA5\x8C",
         FontFallbackPriority::kEmojiEmoji}});
 }
 
 }  // namespace blink