Cocoa: Fix a constraint violation when navigating away from a detached bookmark bar.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_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/bookmarks/bookmark_bar_controller.h"
 
 #include <stddef.h>
 
 #import "base/mac/bundle_locations.h"
 #import "base/mac/foundation_util.h"
@@ skipping 147 matching lines @@
     return;
 
   extensions::RecordAppLaunchType(extension_misc::APP_LAUNCH_BOOKMARK_BAR,
                                   extension->GetType());
 }
 
 }  // namespace
 
 @interface BookmarkBarController ()
 
+// Updates the sizes and positions of the subviews.
+- (void)layoutSubviews;
+
 // Moves to the given next state (from the current state), possibly animating.
 // If |animate| is NO, it will stop any running animation and jump to the given
 // state. If YES, it may either (depending on implementation) jump to the end of
 // the current animation and begin the next one, or stop the current animation
 // mid-flight and animate to the next state.
 - (void)moveToState:(BookmarkBar::State)nextState
       withAnimation:(BOOL)animate;
 
 // Create buttons for all items in the given bookmark node tree.
 // Modifies self->buttons_.  Do not add more buttons than will fit on the view.
@@ skipping 373 matching lines @@
 // NSNotificationCenter callback.
 - (void)parentWindowWillClose:(NSNotification*)notification {
   [self closeFolderAndStopTrackingMenus];
 }
 
 // NSNotificationCenter callback.
 - (void)parentWindowDidResignMain:(NSNotification*)notification {
   [self closeFolderAndStopTrackingMenus];
 }
 
+- (void)layoutToFrame:(NSRect)frame {
+  // The view should be pinned to the top of the window with a flexible width.
+  DCHECK_EQ(NSViewWidthSizable | NSViewMinYMargin,
+            [[self view] autoresizingMask]);
+  [[self view] setFrame:frame];
+  [self layoutSubviews];
+}
+
 // Change the layout of the bookmark bar's subviews in response to a visibility
 // change (e.g., show or hide the bar) or style change (attached or floating).
 - (void)layoutSubviews {
   NSRect frame = [[self view] frame];
   NSRect buttonViewFrame = NSMakeRect(0, 0, NSWidth(frame), NSHeight(frame));
 
   // Add padding to the detached bookmark bar.
   // The state of our morph (if any); 1 is total bubble, 0 is the regular bar.
   CGFloat morph = [self detachedMorphProgress];
   CGFloat padding = 0;
@@ skipping 2423 matching lines @@
 - (id<BookmarkButtonControllerProtocol>)controllerForNode:
     (const BookmarkNode*)node {
   // See if it's in the bar, then if it is in the hierarchy of visible
   // folder menus.
   if (bookmarkModel_->bookmark_bar_node() == node)
     return self;
   return [folderController_ controllerForNode:node];
 }
 
 @end