[Mac] Strip newlines from paste.

chrome/browser/cocoa/autocomplete_text_field.mm

Index: chrome/browser/cocoa/autocomplete_text_field.mm
diff --git a/chrome/browser/cocoa/autocomplete_text_field.mm b/chrome/browser/cocoa/autocomplete_text_field.mm
index 0efb310ac1946f4a5477bdf2facff17267c91810..6d1d5d572e04b5f6dfaedf00c82f7863b8d7da9e 100644
--- a/chrome/browser/cocoa/autocomplete_text_field.mm
+++ b/chrome/browser/cocoa/autocomplete_text_field.mm
@@ -17,4 +17,12 @@
   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