[Mac] Fix Option-return in Omnibox.

chrome/browser/autocomplete/autocomplete_edit_view_mac.mm

Index: chrome/browser/autocomplete/autocomplete_edit_view_mac.mm
diff --git a/chrome/browser/autocomplete/autocomplete_edit_view_mac.mm b/chrome/browser/autocomplete/autocomplete_edit_view_mac.mm
index f49963a13ffcd07ff2b36966419f9139bfc66114..4ca90dfe57c12fdb16f5230711095aa24eb4febb 100644
--- a/chrome/browser/autocomplete/autocomplete_edit_view_mac.mm
+++ b/chrome/browser/autocomplete/autocomplete_edit_view_mac.mm
@@ -757,6 +757,12 @@ std::wstring AutocompleteEditViewMac::GetClipboardText(Clipboard* clipboard) {
     }
   }
 
+  // TODO(shess): Option-tab, would normally insert a literal tab
+  // character.  Consider combining with -insertTab:
+  if (cmd == @selector(insertTabIgnoringFieldEditor:)) {
+    return YES;
+  }
+
   // |-noop:| is sent when the user presses Cmd+Return. Override the no-op
   // behavior with the proper WindowOpenDisposition.
   NSEvent* event = [NSApp currentEvent];
@@ -768,6 +774,12 @@ std::wstring AutocompleteEditViewMac::GetClipboardText(Clipboard* clipboard) {
     return YES;
   }
 
+  // TODO(shess): Option-return, would normally insert a literal
+  // newline.  Consider combining with -insertNewline:.
+  if (cmd == @selector(insertNewlineIgnoringFieldEditor:)) {
+    return YES;
+  }
+
   // When the user does Control-Enter, the existing content has "www."
   // prepended and ".com" appended.  |model_| should already have
   // received notification when the Control key was depressed, but it