New avatar button: Consolidate text elision between Mac and Win/Linux

chrome/browser/ui/cocoa/javascript_app_modal_dialog_cocoa.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/javascript_app_modal_dialog_cocoa.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
@@ skipping 261 matching lines @@
   for (size_t index = 0, slots_count = 0; index < informative_text.length;
       ++index) {
     unichar current_char = [informative_text characterAtIndex:index];
     if ([newline_char_set characterIsMember:current_char])
       slots_count += kSlotsPerLine;
     else
       slots_count++;
     if (slots_count > kMessageTextMaxSlots) {
       base::string16 info_text = base::SysNSStringToUTF16(informative_text);
       informative_text = base::SysUTF16ToNSString(
-          gfx::TruncateString(info_text, index));
+          gfx::TruncateString(info_text, index, gfx::WORD_BREAK));
       break;
     }
   }
 
   [GetAlert() setInformativeText:informative_text];
   NSString* message_text =
       base::SysUTF16ToNSString(dialog_->title());
   [GetAlert() setMessageText:message_text];
   [GetAlert() addButtonWithTitle:default_button];
   if (!one_button) {
@@ skipping 143 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeAppModalDialog, public:
 
 // static
 NativeAppModalDialog* NativeAppModalDialog::CreateNativeJavaScriptPrompt(
     JavaScriptAppModalDialog* dialog,
     gfx::NativeWindow parent_window) {
   return new JavaScriptAppModalDialogCocoa(dialog);
 }