Omnibox UI: Create right-margin on Cocoa dropdown

chrome/browser/ui/cocoa/omnibox/omnibox_popup_matrix.mm

 // Copyright 2013 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/omnibox/omnibox_popup_matrix.h"
 
 #include "base/feature_list.h"
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #import "chrome/browser/ui/cocoa/omnibox/omnibox_popup_cell.h"
@@ skipping 104 matching lines @@
       [OmniboxPopupCell getContentTextHeightForDoubleLine:isDoubleLine];
 
   if (isAnswer) {
     OmniboxPopupMatrix* matrix =
         base::mac::ObjCCastStrict<OmniboxPopupMatrix>(tableView);
     NSRect rowRect = [tableView rectOfColumn:0];
     OmniboxPopupCellData* cellData =
         base::mac::ObjCCastStrict<OmniboxPopupCellData>(
             [array_ objectAtIndex:row]);
     // Subtract any Material Design padding and/or icon.
-    rowRect.size.width = [OmniboxPopupCell getContentAreaWidth:rowRect] -
-                         [matrix contentLeftPadding];
+    rowRect.size.width =
+        [OmniboxPopupCell getTextContentAreaWidth:[matrix contentMaxWidth]];
     NSAttributedString* text = [cellData description];
     // Provide no more than 3 lines of space.
     rowRect.size.height =
         std::min(3, [cellData maxLines]) * [text size].height;
     NSRect textRect =
         [text boundingRectWithSize:rowRect.size
                            options:NSStringDrawingUsesLineFragmentOrigin |
                                    NSStringDrawingTruncatesLastVisibleLine];
     // Add a little padding or it looks cramped.
     int heightProvided = textRect.size.height + 2;
     height += heightProvided;
   }
   return height;
 }
 
 @end
 
 @implementation OmniboxPopupMatrix
 
 @synthesize separator = separator_;
 @synthesize maxMatchContentsWidth = maxMatchContentsWidth_;
 @synthesize contentLeftPadding = contentLeftPadding_;
+@synthesize contentMaxWidth = contentMaxWidth_;
 @synthesize answerLineHeight = answerLineHeight_;
 @synthesize hasDarkTheme = hasDarkTheme_;
 
 - (instancetype)initWithObserver:(OmniboxPopupMatrixObserver*)observer
                     forDarkTheme:(BOOL)isDarkTheme {
   if ((self = [super initWithFrame:NSZeroRect])) {
     observer_ = observer;
     hasDarkTheme_ = isDarkTheme;
 
     base::scoped_nsobject<NSTableColumn> column(
@@ skipping 162 matching lines @@
   [self selectRowIndex:row];
   if (row != -1) {
     DCHECK(observer_);
     observer_->OnMatrixRowSelected(self, row);
     return YES;
   }
   return NO;
 }
 
 @end