Revert of Reset accessibility if it gets out of sync.

content/renderer/accessibility/renderer_accessibility_complete.cc

Index: content/renderer/accessibility/renderer_accessibility_complete.cc
diff --git a/content/renderer/accessibility/renderer_accessibility_complete.cc b/content/renderer/accessibility/renderer_accessibility_complete.cc
index ef0cd11d562c34ca84e86b5965b66466f68ffd9f..6c4cc9245c7630b2bf1fbdd413549fee9cc41e28 100644
--- a/content/renderer/accessibility/renderer_accessibility_complete.cc
+++ b/content/renderer/accessibility/renderer_accessibility_complete.cc
@@ -39,7 +39,6 @@
       serializer_(&tree_source_),
       last_scroll_offset_(gfx::Size()),
       ack_pending_(false),
-      reset_token_(0),
       weak_factory_(this) {
   WebView* web_view = render_frame_->GetRenderView()->GetWebView();
   WebSettings* settings = web_view->settings();
@@ -81,7 +80,6 @@
     IPC_MESSAGE_HANDLER(AccessibilityMsg_SetTextSelection,
                         OnSetTextSelection)
     IPC_MESSAGE_HANDLER(AccessibilityMsg_HitTest, OnHitTest)
-    IPC_MESSAGE_HANDLER(AccessibilityMsg_Reset, OnReset)
     IPC_MESSAGE_HANDLER(AccessibilityMsg_FatalError, OnFatalError)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
@@ -229,8 +227,7 @@
             << "\n" << event_msg.update.ToString();
   }
 
-  Send(new AccessibilityHostMsg_Events(routing_id(), event_msgs, reset_token_));
-  reset_token_ = 0;
+  Send(new AccessibilityHostMsg_Events(routing_id(), event_msgs));
 
   if (had_layout_complete_messages)
     SendLocationChanges();
@@ -417,16 +414,6 @@
     obj.setFocused(true);
 }
 
-void RendererAccessibilityComplete::OnReset(int reset_token) {
-  reset_token_ = reset_token;
-  serializer_.Reset();
-  pending_events_.clear();
-
-  const WebDocument& document = GetMainDocument();
-  if (!document.isNull())
-    HandleAXEvent(document.accessibilityObject(), ui::AX_EVENT_LAYOUT_COMPLETE);
-}
-
 void RendererAccessibilityComplete::OnFatalError() {
   CHECK(false) << "Invalid accessibility tree.";
 }