Move JoinString to the base namespace.

chrome/browser/extensions/requirements_checker_browsertest.cc

 // Copyright (c) 2012 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 <vector>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 47 matching lines @@
     called = true;
 #endif
 
     static const std::string json_blacklist =
       "{\n"
       "  \"name\": \"gpu blacklist\",\n"
       "  \"version\": \"1.0\",\n"
       "  \"entries\": [\n"
       "    {\n"
       "      \"id\": 1,\n"
-      "      \"features\": [\"" + JoinString(features, "\", \"") + "\"]\n"
+      "      \"features\": [\"" + base::JoinString(features, "\", \"") + "\"]\n"
       "    }\n"
       "  ]\n"
       "}";
     gpu::GPUInfo gpu_info;
     content::GpuDataManager::GetInstance()->InitializeForTesting(
         json_blacklist, gpu_info);
   }
 
  protected:
   scoped_ptr<RequirementsChecker> checker_;
@@ skipping 77 matching lines @@
         IDS_EXTENSION_WEBGL_NOT_SUPPORTED));
   }
 
   checker_->Check(extension, base::Bind(
       &RequirementsCheckerBrowserTest::ValidateRequirementErrors,
       base::Unretained(this), expected_errors));
   content::RunAllBlockingPoolTasksUntilIdle();
 }
 
 }  // namespace extensions