Release the autocomplete popup panel when not visible.

chrome/browser/autocomplete/autocomplete_popup_view_mac.mm

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/autocomplete/autocomplete_popup_view_mac.h"
 
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_edit.h"
 #include "chrome/browser/autocomplete/autocomplete_edit_view_mac.h"
 #include "chrome/browser/autocomplete/autocomplete_popup_model.h"
@@ skipping 93 matching lines @@
     [table addTableColumn:MakeTableColumn(1, [NSImageCell class])];
     [table addTableColumn:MakeTableColumn(2, [NSTextFieldCell class])];
   }
 }
 
 void AutocompletePopupViewMac::UpdatePopupAppearance() {
   const AutocompleteResult& result = model_->result();
   if (result.empty()) {
     [[popup_ parentWindow] removeChildWindow:popup_];
     [popup_ orderOut:nil];
+
+    // Break references to table_target_ releasing popup_.
+    NSTableView* table = [popup_ contentView];
+    [table setTarget:nil];
+    [table setDataSource:nil];
+
+    popup_.reset(nil);
+
     return;
   }
 
   CreatePopupIfNeeded();
 
   // Layout the popup and size it to land underneath the field.
   // TODO(shess) Consider refactoring to remove this depenency,
   // because the popup doesn't need any of the field-like aspects of
   // field_.  The edit view could expose helper methods for attaching
   // the window to the field.
@@ skipping 123 matching lines @@
 
   return as;
 }
 
 - (void)select:sender {
   DCHECK(popup_view_);
   popup_view_->AcceptInput();
 }
 
 @end