[Mac] Adjust omnibox decoration dragging to keep image under mouse.

chrome/browser/cocoa/location_bar/location_icon_decoration.h

Index: chrome/browser/cocoa/location_bar/location_icon_decoration.h
diff --git a/chrome/browser/cocoa/location_bar/location_icon_decoration.h b/chrome/browser/cocoa/location_bar/location_icon_decoration.h
index 9d705a8f74458ef6c620b576b4fa14cc5e6ffe65..ec1426401e42b946b1b41b48d14aef1c90b0c5e0 100644
--- a/chrome/browser/cocoa/location_bar/location_icon_decoration.h
+++ b/chrome/browser/cocoa/location_bar/location_icon_decoration.h
@@ -23,6 +23,9 @@ class LocationIconDecoration : public ImageDecoration {
   virtual bool IsDraggable();
   virtual NSPasteboard* GetDragPasteboard();
   virtual NSImage* GetDragImage() { return GetImage(); }
+  virtual NSRect GetDragImageFrame(NSRect frame) {
+    return GetDrawRectInFrame(frame);
+  }
 
   // Show the page info panel on click.
   virtual bool OnMousePressed(NSRect frame);