Relanding 49339 ...

chrome/browser/tab_contents/tab_contents.cc

Index: chrome/browser/tab_contents/tab_contents.cc
===================================================================
--- chrome/browser/tab_contents/tab_contents.cc	(revision 49343)
+++ chrome/browser/tab_contents/tab_contents.cc	(working copy)
@@ -296,7 +296,6 @@
       opener_dom_ui_type_(DOMUIFactory::kNoDOMUI),
       language_state_(&controller_),
       geolocation_settings_state_(profile),
-      requested_accessibility_tree_(false),
       closed_by_user_gesture_(false) {
   ClearBlockedContentSettings();
   renderer_preferences_util::UpdateFromSystemSettings(
@@ -355,10 +354,6 @@
   // Set-up the showing of the omnibox search infobar if applicable.
   if (OmniboxSearchHint::IsEnabled(profile))
     omnibox_search_hint_.reset(new OmniboxSearchHint(this));
-
-  renderer_accessible_ =
-    CommandLine::ForCurrentProcess()->HasSwitch(
-        switches::kEnableRendererAccessibility);
 }
 
 TabContents::~TabContents() {
@@ -2147,10 +2142,8 @@
 
 void TabContents::DocumentLoadedInFrame() {
   controller_.DocumentLoadedInFrame();
-  if (renderer_accessible_ && !requested_accessibility_tree_) {
-    render_view_host()->RequestAccessibilityTree();
-    requested_accessibility_tree_ = true;
-  }
+
+  render_view_host()->SetDocumentLoaded(true);
 }
 
 void TabContents::OnContentBlocked(ContentSettingsType type) {
@@ -2320,7 +2313,7 @@
                               const ViewHostMsg_FrameNavigate_Params& params) {
   int extra_invalidate_flags = 0;
 
-  requested_accessibility_tree_ = false;
+  render_view_host()->SetDocumentLoaded(false);
 
   if (PageTransition::IsMainFrame(params.transition)) {
     bool was_bookmark_bar_visible = ShouldShowBookmarkBar();