Center permission bubble if location bar is hidden in MacOS.

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 c8ca24ceb8e9ee0ab1f03a2514bad677968b67f4..0b795c491aac8afa34b4047af010904fc8ce6f8f 100644
--- a/chrome/browser/ui/cocoa/base_bubble_controller.mm
+++ b/chrome/browser/ui/cocoa/base_bubble_controller.mm
@@ -341,10 +341,8 @@
           origin.x -= offsets.width;
           break;
         case info_bubble::kTopCenter:
-          origin.x -= NSWidth([window frame]) / 2.0;
-          break;
         case info_bubble::kNoArrow:

[groby-ooo-7-16, 2015/03/10 23:34:13]

If we _must_ fall through, mark this as // FALLTHROUGH

But I don't think this works - the zoom bubble uses kNoArrow
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/ui/...

So does new credit card bubble:
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/ui/...

You should probably check where we want those anchored in the no-arrow case (and
compare with where Views anchors noarrow)

[hcarmona, 2015/03/11 22:38:03]

Updated with // FALLTHROUGH.

Looked into the zoom and credit card bubbles: both use
kAlignRightEdgeToAnchorEdge to align with the anchor and not draw an arrow.

This change will center bubbles that want to kAlignArrowToAnchor but not show an
arrow.

-          NOTREACHED();
+          origin.x -= NSWidth([window frame]) / 2.0;
           break;
       }
       break;