[Mac] Misc fixes for the new avatar bubble

chrome/browser/ui/cocoa/base_bubble_controller.mm

Index: chrome/browser/ui/cocoa/base_bubble_controller.mm
diff --git a/chrome/browser/ui/cocoa/base_bubble_controller.mm b/chrome/browser/ui/cocoa/base_bubble_controller.mm
index 2628f054b5f22ba95cef1810e560206f57918a5f..9cec07c3ebe5381a2eaec2534db9bf374fcd6cc9 100644
--- a/chrome/browser/ui/cocoa/base_bubble_controller.mm
+++ b/chrome/browser/ui/cocoa/base_bubble_controller.mm
@@ -141,7 +141,7 @@
   anchorOffset_.y -= anchor_.y;
 }
 
-- (NSBox*)separatorWithFrame:(NSRect)frame {
+- (NSBox*)horizontalSeparatorWithFrame:(NSRect)frame {
   frame.size.height = 1.0;
   base::scoped_nsobject<NSBox> spacer([[NSBox alloc] initWithFrame:frame]);
   [spacer setBoxType:NSBoxSeparator];
@@ -150,6 +150,15 @@
   return [spacer.release() autorelease];
 }
 
+- (NSBox*)verticalSeparatorWithFrame:(NSRect)frame {
+  frame.size.width = 1.0;
+  base::scoped_nsobject<NSBox> spacer([[NSBox alloc] initWithFrame:frame]);
+  [spacer setBoxType:NSBoxSeparator];
+  [spacer setBorderType:NSLineBorder];
+  [spacer setAlphaValue:0.2];
+  return [spacer.release() autorelease];
+}
+
 - (void)parentWindowDidResize:(NSNotification*)notification {
   DCHECK_EQ(parentWindow_, [notification object]);
   NSPoint newOrigin = NSMakePoint(NSMinX([parentWindow_ frame]),