Added support for multiple parameters to Extension API callbacks.

chrome/browser/extensions/api/web_navigation/web_navigation_api.cc

Index: chrome/browser/extensions/api/web_navigation/web_navigation_api.cc
diff --git a/chrome/browser/extensions/api/web_navigation/web_navigation_api.cc b/chrome/browser/extensions/api/web_navigation/web_navigation_api.cc
index 82fe920c80c7217b6126fac03f45f1dc1834f97d..ebd484ae11b65bc6c78a5ba90b29bdeeeb12a6a6 100644
--- a/chrome/browser/extensions/api/web_navigation/web_navigation_api.cc
+++ b/chrome/browser/extensions/api/web_navigation/web_navigation_api.cc
@@ -724,7 +724,7 @@ bool GetFrameFunction::RunImpl() {
   int tab_id = params->details.tab_id;
   int frame_id = params->details.frame_id;
 
-  result_.reset(Value::CreateNullValue());
+  SetSingleResult(Value::CreateNullValue());
 
   TabContents* tab_contents;
   if (!ExtensionTabUtil::GetTabById(tab_id,
@@ -758,7 +758,7 @@ bool GetFrameFunction::RunImpl() {
   frame_details.url = frame_url.spec();
   frame_details.error_occurred =
       frame_navigation_state.GetErrorOccurredInFrame(frame_id);
-  result_.reset(GetFrame::Result::Create(frame_details));
+  SetSingleResult(GetFrame::Result::Create(frame_details));
   return true;
 }
 
@@ -767,7 +767,7 @@ bool GetAllFramesFunction::RunImpl() {
   EXTENSION_FUNCTION_VALIDATE(params.get());
   int tab_id = params->details.tab_id;
 
-  result_.reset(Value::CreateNullValue());
+  SetSingleResult(Value::CreateNullValue());
 
   TabContents* tab_contents;
   if (!ExtensionTabUtil::GetTabById(tab_id,
@@ -803,7 +803,7 @@ bool GetAllFramesFunction::RunImpl() {
     frame->error_occurred = navigation_state.GetErrorOccurredInFrame(frame_id);
     result_list.push_back(frame);
   }
-  result_.reset(GetAllFrames::Result::Create(result_list));
+  SetSingleResult(GetAllFrames::Result::Create(result_list));
   return true;
 }