Omnibox UI: Create right-margin on Cocoa dropdown

chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.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.
 
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.h"
 
 #include <cmath>
 
 #include "base/feature_list.h"
 #include "base/mac/mac_util.h"
@@ skipping 255 matching lines @@
   background_rect.size.width = NSWidth(popup_frame);
   background_rect.size.height = NSHeight(popup_frame) -
       NSHeight(top_separator_frame) - NSHeight(bottom_separator_frame);
   background_rect.origin.y = NSMaxY(top_separator_frame);
   [background_view_ setFrame:background_rect];
 
   // Matrix.
   NSRect matrix_frame = NSZeroRect;
   matrix_frame.origin.x = 0;
   [matrix_ setContentLeftPadding:match_omnibox_width ? 0 : field_origin_base.x];
+  [matrix_ setContentMaxWidth:NSWidth([field_ bounds])];
   matrix_frame.origin.y = PopupPaddingVertical();
   matrix_frame.size.width = table_width;
   matrix_frame.size.height = matrixHeight;
   [matrix_ setFrame:matrix_frame];
   [[[matrix_ tableColumns] objectAtIndex:0] setWidth:table_width];
 
   // Don't play animation games on first display.
   target_popup_frame_ = popup_frame;
   if (![popup_ parentWindow]) {
     DCHECK(![popup_ isVisible]);
@@ skipping 63 matching lines @@
   return NSImageFromImageSkia(
       gfx::CreateVectorIcon(vector_icon, kIconSize, icon_color));
 }
 
 void OmniboxPopupViewMac::OpenURLForRow(size_t row,
                                         WindowOpenDisposition disposition) {
   DCHECK_LT(row, GetResult().size());
   omnibox_view_->OpenMatch(GetResult().match_at(row), disposition, GURL(),
                            base::string16(), row);
 }