Set line break mode for omnibox field editor

chrome/browser/ui/cocoa/omnibox/omnibox_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_view_mac.h"
 
 #include <Carbon/Carbon.h>  // kVK_Return
 
 #include "base/mac/foundation_util.h"
 #include "base/strings/string_util.h"
@@ skipping 412 matching lines @@
   [as addAttribute:@"NSLanguage" value:@"en_US_POSIX"
              range:as_entire_string];
 
   // Make a paragraph style locking in the standard line height as the maximum,
   // otherwise the baseline may shift "downwards".
   base::scoped_nsobject<NSMutableParagraphStyle> paragraph_style(
       [[NSMutableParagraphStyle alloc] init]);
   CGFloat line_height = [[field_ cell] lineHeight];
   [paragraph_style setMaximumLineHeight:line_height];
   [paragraph_style setMinimumLineHeight:line_height];
+  [paragraph_style setLineBreakMode:NSLineBreakByTruncatingTail];
   [as addAttribute:NSParagraphStyleAttributeName value:paragraph_style
              range:as_entire_string];
 
   url_parse::Component scheme, host;
   AutocompleteInput::ParseForEmphasizeComponents(
       display_text, &scheme, &host);
   bool grey_out_url = display_text.substr(scheme.begin, scheme.len) ==
       UTF8ToUTF16(extensions::kExtensionScheme);
   if (model()->CurrentTextIsURL() &&
       (host.is_nonempty() || grey_out_url)) {
@@ skipping 498 matching lines @@
 
 NSUInteger OmniboxViewMac::GetTextLength() const {
   return [field_ currentEditor] ?  [[[field_ currentEditor] string] length] :
                                    [[field_ stringValue] length];
 }
 
 bool OmniboxViewMac::IsCaretAtEnd() const {
   const NSRange selection = GetSelectedRange();
   return NSMaxRange(selection) == GetTextLength();
 }