[Mac] Handle shift-delete when omnibox popup is up.

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 69a1b4ee32dd4578503bcc95eef4d7763fa2c325..f49963a13ffcd07ff2b36966419f9139bfc66114 100644
--- a/chrome/browser/autocomplete/autocomplete_edit_view_mac.mm
+++ b/chrome/browser/autocomplete/autocomplete_edit_view_mac.mm
@@ -653,6 +653,10 @@ bool AutocompleteEditViewMac::IsPopupOpen() const {
   return popup_view_->IsOpen();
 }
 
+void AutocompleteEditViewMac::TryDeletingCurrentItem() {
+  popup_view_->GetModel()->TryDeletingCurrentItem();
+}
+
 void AutocompleteEditViewMac::OnControlKeyChanged(bool pressed) {
   model_->OnControlKeyChanged(pressed);
 }
@@ -782,6 +786,16 @@ std::wstring AutocompleteEditViewMac::GetClipboardText(Clipboard* clipboard) {
     }
   }
 
+  if (cmd == @selector(deleteForward:)) {
+    const NSUInteger modifiers = [[NSApp currentEvent] modifierFlags];
+    if ((modifiers & NSShiftKeyMask) != 0) {
+      if (edit_view_->IsPopupOpen()) {
+        edit_view_->TryDeletingCurrentItem();
+        return YES;
+      }
+    }
+  }
+
   // Capture the state before the operation changes the content.
   // TODO(shess): Determine if this is always redundent WRT the call
   // in -controlTextDidChange:.