Added chrome.i18n extension API.
The API proposal doc is 
http://sites.google.com/a/chromium.org/dev/developers/design-documents/extensions/i18n-api

This CL only adds the getter of accept languages: 
chrome.i18n.getAcceptLanguages().

The setter of accept languages will be added in a separate CL.

BUG=http://crbug.com/14574
TEST=TEST=There is an extension in chrome\test\data\extensions\samples\i18n.
Load this extension. It creates a toolstrip button.  Click this button, you
should get chrome's accept languages.
Review URL: http://codereview.chromium.org/174116

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25810 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/extension_function_dispatcher.cc b/chrome/browser/extensions/extension_function_dispatcher.cc
index d0281c3..276dd16 100644
--- a/chrome/browser/extensions/extension_function_dispatcher.cc
+++ b/chrome/browser/extensions/extension_function_dispatcher.cc
@@ -10,6 +10,7 @@
 #include "chrome/browser/extensions/extension_bookmarks_module.h"
 #include "chrome/browser/extensions/extension_bookmarks_module_constants.h"
 #include "chrome/browser/extensions/extension_function.h"
+#include "chrome/browser/extensions/extension_i18n_api.h"
 #include "chrome/browser/extensions/extension_message_service.h"
 #include "chrome/browser/extensions/extension_page_actions_module.h"
 #include "chrome/browser/extensions/extension_page_actions_module_constants.h"
@@ -69,6 +70,7 @@
   // Register all functions here.
 
   namespace bookmarks = extension_bookmarks_module_constants;
+  namespace i18n = extension_i18n_api_functions;
   namespace page_actions = extension_page_actions_module_constants;
   namespace tabs = extension_tabs_module_constants;
   namespace test = extension_test_api_functions;
@@ -142,6 +144,10 @@
   factories_[toolstrip::kCollapseFunction] =
       &NewExtensionFunction<ToolstripCollapseFunction>;
 
+  // I18N.
+  factories_[i18n::kGetAcceptLanguagesFunction] =
+      &NewExtensionFunction<GetAcceptLanguagesFunction>;
+
   // Test.
   factories_[test::kPassFunction] =
       &NewExtensionFunction<ExtensionTestPassFunction>;