[Mac] Convert Omnibox paste-and-go to use AutocompleteTextFieldObserver.

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 efc114a26d575ed90edbbb6183806df4cbdf905b..f48d508abe44e33c5120c8c42614df0c8e206797 100644
--- a/chrome/browser/cocoa/autocomplete_text_field.mm
+++ b/chrome/browser/cocoa/autocomplete_text_field.mm
@@ -19,21 +19,6 @@
   DCHECK([[self cell] isKindOfClass:[AutocompleteTextFieldCell class]]);
 }
 
-- (NSString*)textPasteActionString:(NSText*)fieldEditor {
-  id delegate = [self delegate];
-  if ([delegate respondsToSelector:@selector(control:textPasteActionString:)]) {
-    return [delegate control:self textPasteActionString:fieldEditor];
-  }
-  return nil;
-}
-
-- (void)textDidPasteAndGo:(NSText*)fieldEditor {
-  id delegate = [self delegate];
-  if ([delegate respondsToSelector:@selector(control:textDidPasteAndGo:)]) {
-    [delegate control:self textDidPasteAndGo:fieldEditor];
-  }
-}
-
 - (void)flagsChanged:(NSEvent*)theEvent {
   bool controlFlag = ([theEvent modifierFlags]&NSControlKeyMask) != 0;
   observer_->OnControlKeyChanged(controlFlag);