Fixes crash by checking for NULL when showing popup. This can happen

chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.cc

Index: chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.cc
diff --git a/chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.cc b/chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.cc
index 10cf6882f4c57f48b7df489ec541312001e3b863..bf104f26523436520b0a121abe16b41ed077b56d 100644
--- a/chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.cc
+++ b/chrome/browser/ui/views/autocomplete/autocomplete_popup_contents_view.cc
@@ -364,6 +364,13 @@ void AutocompletePopupContentsView::UpdatePopupAppearance() {
     popup_->SetContentsView(this);
     popup_->MoveAbove(
         GetRelativeWindowForPopup(omnibox_view_->GetNativeView()));
+    if (!popup_.get()) {
+      // For some IMEs GetRelativeWindowForPopup triggers the omnibox to lose
+      // focus, thereby closing (and destroying) the popup.
+      // TODO: this won't be needed once we close the omnibox on input window

[Peter Kasting, 2011/09/12 18:36:52]

? We explicitly wanted to avoid closing the omnibox when the input window was
showing, hence the current code that tries to avoid overlapping the two.

+      // showing.
+      return;
+    }
     popup_->Show();
   } else {
     // Animate the popup shrinking, but don't animate growing larger since that