[Mac] Strip newlines from paste.

chrome/browser/cocoa/autocomplete_text_field.mm

 // Copyright (c) 2009 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/cocoa/autocomplete_text_field.h"
 
 #include "base/logging.h"
 #include "chrome/browser/cocoa/autocomplete_text_field_cell.h"
 
 @implementation AutocompleteTextField
 
 + (Class)cellClass {
   return [AutocompleteTextFieldCell class];
 }
 
 - (void)awakeFromNib {
   DCHECK([[self cell] isKindOfClass:[AutocompleteTextFieldCell class]]);
 }
 
+- (BOOL)textShouldPaste:(NSText*)fieldEditor {
+  id delegate = [self delegate];
+  if ([delegate respondsToSelector:@selector(control:textShouldPaste:)]) {
+    return [delegate control:self textShouldPaste:fieldEditor];
+  }
+  return YES;
+}
+
 @end