Move SetJavaScriptFlags() from webkit to content.

webkit/glue/webkit_glue.h

 // Copyright 2013 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.
 
 #ifndef WEBKIT_GLUE_WEBKIT_GLUE_H_
 #define WEBKIT_GLUE_WEBKIT_GLUE_H_
 
-#include <string>
+#include "webkit/glue/webkit_glue_export.h"
 
-#include "base/platform_file.h"
-#include "webkit/glue/webkit_glue_export.h"
+namespace base {
+struct PlatformFileInfo;
+}
 
 namespace blink {
 struct WebFileInfo;
 }
 
 namespace webkit_glue {
 
-WEBKIT_GLUE_EXPORT void SetJavaScriptFlags(const std::string& flags);
-
 // File info conversion
 WEBKIT_GLUE_EXPORT void PlatformFileInfoToWebFileInfo(
     const base::PlatformFileInfo& file_info,
     blink::WebFileInfo* web_file_info);
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_WEBKIT_GLUE_H_