Break two classes defined in json_value_serializer.cc, .h into separate files.

chrome/test/automation/javascript_execution_controller.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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 "chrome/test/automation/javascript_execution_controller.h"
 
-#include "base/json/json_value_serializer.h"
+#include "base/json/json_string_value_serializer.h"
 #include "chrome/test/automation/javascript_message_utils.h"
 
 using javascript_utils::JavaScriptPrintf;
 
 // Initialize this timeout to an invalid value. Each test framework or test
 // must set an appropriate timeout using set_timeout, or the
 // JavaScriptExecutionController will complain.
 int JavaScriptExecutionController::timeout_ms_ = -1;
 
 JavaScriptExecutionController::JavaScriptExecutionController() {}
@@ skipping 83 matching lines @@
     return false;
   }
   if (!success) {
     LOG(WARNING) << "JavaScript evaluation did not complete successfully: "
                  << evaluation_error;
     return false;
   }
   result->reset(evaluation_result_value);
   return true;
 }