[Mac] Fix bookmark bar no item container autoresizing mask

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm
index 959b844c8ae0b4643798afc7eb3acb19fc008fdc..3604818ed787afe6e52b0cb73a54a85b895fb104 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_view_cocoa.mm
@@ -84,6 +84,7 @@ static const CGFloat kTextFieldTrailingPadding = 5;
         [[NSView alloc] initWithFrame:NSMakeRect(0, 0, kInitialContainerWidth,
                                                  kInitialContainerHeight)]);
     [noItemContainer_ setAutoresizingMask:NSViewMaxXMargin];
+    [noItemContainer_ setAutoresizingMask:NSViewWidthSizable];
 
     noItemTextfield_.reset([[NSTextField alloc]
         initWithFrame:NSMakeRect(kInitialTextFieldXOrigin,