Remove owned views from AXAuraObjCache when widget is deleted.

chrome/browser/ui/aura/accessibility/ax_tree_source_aura.cc

 // Copyright 2014 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/ui/aura/accessibility/ax_tree_source_aura.h"
 
 #include <vector>
 
 #include "chrome/browser/ui/aura/accessibility/automation_manager_aura.h"
 #include "content/public/browser/render_frame_host.h"
@@ skipping 10 matching lines @@
 AXTreeSourceAura::AXTreeSourceAura() {
   root_.reset(new AXRootObjWrapper(AXAuraObjCache::GetInstance()->GetNextID()));
 }
 
 AXTreeSourceAura::~AXTreeSourceAura() {
   root_.reset();
 }
 
 void AXTreeSourceAura::DoDefault(int32 id) {
   AXAuraObjWrapper* obj = AXAuraObjCache::GetInstance()->Get(id);
-  CHECK(obj);
-  obj->DoDefault();
+  if (obj)
+    obj->DoDefault();
 }
 
 void AXTreeSourceAura::Focus(int32 id) {
   AXAuraObjWrapper* obj = AXAuraObjCache::GetInstance()->Get(id);
-  CHECK(obj);
-  obj->Focus();
+  if (obj)
+    obj->Focus();
 }
 
 void AXTreeSourceAura::MakeVisible(int32 id) {
   AXAuraObjWrapper* obj = AXAuraObjCache::GetInstance()->Get(id);
-  CHECK(obj);
-  obj->MakeVisible();
+  if (obj)
+    obj->MakeVisible();
 }
 
 void AXTreeSourceAura::SetSelection(int32 id, int32 start, int32 end) {
   AXAuraObjWrapper* obj = AXAuraObjCache::GetInstance()->Get(id);
-  CHECK(obj);
-  obj->SetSelection(start, end);
+  if (obj)
+    obj->SetSelection(start, end);
 }
 
 void AXTreeSourceAura::ShowContextMenu(int32 id) {
   AXAuraObjWrapper* obj = AXAuraObjCache::GetInstance()->Get(id);
-  CHECK(obj);
-  obj->ShowContextMenu();
+  if (obj)
+    obj->ShowContextMenu();
 }
 
 AXAuraObjWrapper* AXTreeSourceAura::GetRoot() const {
   return root_.get();
 }
 
 AXAuraObjWrapper* AXTreeSourceAura::GetFromId(int32 id) const {
   if (id == root_->GetID())
     return root_.get();
   return AXAuraObjCache::GetInstance()->Get(id);
@@ skipping 56 matching lines @@
 
   std::vector<AXAuraObjWrapper*> children;
   root->GetChildren(&children);
 
   prefix += prefix[0];
   for (size_t i = 0; i < children.size(); ++i)
     output += ToString(children[i], prefix);
 
   return output;
 }