Add per-tab "JavaScript enabled" preference.

chrome/browser/tab_contents/render_view_host_delegate_helper.cc

 // Copyright (c) 2011 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/browser/tab_contents/render_view_host_delegate_helper.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/string_util.h"
@@ skipping 382 matching lines @@
               std::make_pair(*iter, value));
     }
   }
   web_prefs.tabs_to_links = prefs->GetBoolean(prefs::kWebkitTabsToLinks);
 
   {  // Command line switches are used for preferences with no user interface.
     const CommandLine& command_line = *CommandLine::ForCurrentProcess();
     web_prefs.developer_extras_enabled = true;
     web_prefs.javascript_enabled =
         !command_line.HasSwitch(switches::kDisableJavaScript) &&
-        prefs->GetBoolean(prefs::kWebKitJavascriptEnabled);
+        prefs->GetBoolean(prefs::kWebKitGlobalJavascriptEnabled);
     web_prefs.web_security_enabled =
         !command_line.HasSwitch(switches::kDisableWebSecurity) &&
         prefs->GetBoolean(prefs::kWebKitWebSecurityEnabled);
     web_prefs.plugins_enabled =
         !command_line.HasSwitch(switches::kDisablePlugins) &&
         prefs->GetBoolean(prefs::kWebKitPluginsEnabled);
     web_prefs.java_enabled =
         !command_line.HasSwitch(switches::kDisableJava) &&
         prefs->GetBoolean(prefs::kWebKitJavaEnabled);
     web_prefs.loads_images_automatically =
@@ skipping 167 matching lines @@
   DictionaryValue* inspector_settings = update.Get();
   inspector_settings->SetWithoutPathExpansion(key,
                                               Value::CreateStringValue(value));
 }
 
 void RenderViewHostDelegateHelper::ClearInspectorSettings(
     content::BrowserContext* browser_context) {
   Profile::FromBrowserContext(browser_context)->GetPrefs()->
       ClearPref(prefs::kWebKitInspectorSettings);
 }