Move autofill related WebView{Delegate} methods into the WebKit API....

chrome/browser/webdata/web_data_service.h

Index: chrome/browser/webdata/web_data_service.h
===================================================================
--- chrome/browser/webdata/web_data_service.h	(revision 29209)
+++ chrome/browser/webdata/web_data_service.h	(working copy)
@@ -57,7 +57,7 @@
   PASSWORD_IE7_RESULT,   // WDResult<IE7PasswordInfo>
 #endif
   WEB_APP_IMAGES,        // WDResult<WDAppImagesResult>
-  AUTOFILL_VALUE_RESULT, // WDResult<std::vector<std::wstring>>
+  AUTOFILL_VALUE_RESULT, // WDResult<std::vector<string16>>
 } WDResultType;
 
 // Result from GetWebAppImages.
@@ -382,16 +382,16 @@
   // form input fields named |name|.  The method OnWebDataServiceRequestDone of
   // |consumer| gets called back when the request is finished, with the vector
   // included in the argument |result|.
-  Handle GetFormValuesForElementName(const std::wstring& name,
-                                     const std::wstring& prefix,
+  Handle GetFormValuesForElementName(const string16& name,
+                                     const string16& prefix,
                                      int limit,
                                      WebDataServiceConsumer* consumer);
 
   // Removes form elements recorded for autofill from the database.
   void RemoveFormElementsAddedBetween(const base::Time& delete_begin,
                                       const base::Time& delete_end);
-  void RemoveFormValueForElementName(const std::wstring& name,
-                                     const std::wstring& value);
+  void RemoveFormValueForElementName(const string16& name,
+                                     const string16& value);
 
  protected:
   friend class TemplateURLModelTest;
@@ -468,11 +468,11 @@
       GenericRequest<std::vector<webkit_glue::AutofillForm::Element> >*
           request);
   void GetFormValuesForElementNameImpl(WebDataRequest* request,
-      const std::wstring& name, const std::wstring& prefix, int limit);
+      const string16& name, const string16& prefix, int limit);
   void RemoveFormElementsAddedBetweenImpl(
       GenericRequest2<base::Time, base::Time>* request);
   void RemoveFormValueForElementNameImpl(
-      GenericRequest2<std::wstring, std::wstring>* request);
+      GenericRequest2<string16, string16>* request);
 
   //////////////////////////////////////////////////////////////////////////////
   //