Center permission bubble if location bar is hidden in MacOS.

chrome/browser/ui/cocoa/base_bubble_controller.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/base_bubble_controller.h"
 
 #include "base/logging.h"
 #include "base/mac/bundle_locations.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/mac_util.h"
@@ skipping 323 matching lines @@
                                   info_bubble::kBubbleArrowWidth / 2.0, 0);
       offsets = [[parentWindow_ contentView] convertSize:offsets toView:nil];
       switch ([bubble_ arrowLocation]) {
         case info_bubble::kTopRight:
           origin.x -= NSWidth([window frame]) - offsets.width;
           break;
         case info_bubble::kTopLeft:
           origin.x -= offsets.width;
           break;
         case info_bubble::kTopCenter:
+        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.

           origin.x -= NSWidth([window frame]) / 2.0;
           break;
-        case info_bubble::kNoArrow:
-          NOTREACHED();
-          break;
       }
       break;
     }
 
     case info_bubble::kAlignEdgeToAnchorEdge:
       // If the arrow is to the right then move the origin so that the right
       // edge aligns with the anchor. If the arrow is to the left then there's
       // nothing to do because the left edge is already aligned with the left
       // edge of the anchor.
       if ([bubble_ arrowLocation] == info_bubble::kTopRight) {
@@ skipping 19 matching lines @@
 
 - (void)activateTabWithContents:(content::WebContents*)newContents
                previousContents:(content::WebContents*)oldContents
                         atIndex:(NSInteger)index
                          reason:(int)reason {
   // The user switched tabs; close.
   [self close];
 }
 
 @end  // BaseBubbleController