[rAC, OSX] Use a bubble for tooltips.

chrome/browser/ui/cocoa/autofill/autofill_main_container.h

Index: chrome/browser/ui/cocoa/autofill/autofill_main_container.h
diff --git a/chrome/browser/ui/cocoa/autofill/autofill_main_container.h b/chrome/browser/ui/cocoa/autofill/autofill_main_container.h
index f5afe3ace5b1854d7b61b247ad8f77e20002b741..2c40042262c5cdb06ddd523ffbd1e0f4ef95560b 100644
--- a/chrome/browser/ui/cocoa/autofill/autofill_main_container.h
+++ b/chrome/browser/ui/cocoa/autofill/autofill_main_container.h
@@ -15,6 +15,7 @@
 @class AutofillDialogWindowController;
 @class AutofillNotificationContainer;
 @class AutofillSectionContainer;
+@class AutofillTooltipController;
 @class GTMWidthBasedTweaker;
 @class HyperlinkTextView;
 
@@ -31,7 +32,7 @@ namespace autofill {
   base::scoped_nsobject<GTMWidthBasedTweaker> buttonContainer_;
   base::scoped_nsobject<NSImageView> buttonStripImage_;
   base::scoped_nsobject<NSButton> saveInChromeCheckbox_;
-  base::scoped_nsobject<NSImageView> saveInChromeTooltip_;
+  base::scoped_nsobject<AutofillTooltipController> saveInChromeTooltip_;
   base::scoped_nsobject<AutofillDetailsContainer> detailsContainer_;
   base::scoped_nsobject<HyperlinkTextView> legalDocumentsView_;
   base::scoped_nsobject<AutofillNotificationContainer> notificationContainer_;