[Mac] In modal JS dialogs with text fields, disable line breaks and just overflow the text box.

chrome/browser/ui/cocoa/js_modal_dialog_cocoa.mm

Index: chrome/browser/ui/cocoa/js_modal_dialog_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/js_modal_dialog_cocoa.mm b/chrome/browser/ui/cocoa/js_modal_dialog_cocoa.mm
index 5568d70e0e369da7c6c1b1f5ad5491f19bddfc83..219c448ebcf4bd2fd96a135c0ada4ac905e53848 100644
--- a/chrome/browser/ui/cocoa/js_modal_dialog_cocoa.mm
+++ b/chrome/browser/ui/cocoa/js_modal_dialog_cocoa.mm
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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.
 
@@ -41,6 +41,7 @@
 
 - (NSTextField*)textField {
   textField_ = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 0, 300, 22)];
+  [[textField_ cell] setLineBreakMode:NSLineBreakByTruncatingTail];
   [alert_ setAccessoryView:textField_];
   [textField_ release];