[DRAFT] Create RenderFrameHostManager.

chrome/browser/extensions/api/web_navigation/frame_navigation_state.cc

Index: chrome/browser/extensions/api/web_navigation/frame_navigation_state.cc
diff --git a/chrome/browser/extensions/api/web_navigation/frame_navigation_state.cc b/chrome/browser/extensions/api/web_navigation/frame_navigation_state.cc
index aca20fbd4ec55bc3d8be7d58ff028c3f1d9cd6fb..153780a4005ac9b3b7452b92278fe9859cc019d6 100644
--- a/chrome/browser/extensions/api/web_navigation/frame_navigation_state.cc
+++ b/chrome/browser/extensions/api/web_navigation/frame_navigation_state.cc
@@ -159,7 +159,8 @@ void FrameNavigationState::StopTrackingFramesInRVH(
 void FrameNavigationState::UpdateFrame(FrameID frame_id, const GURL& url) {
   FrameIdToStateMap::iterator frame_state = frame_state_map_.find(frame_id);
   if (frame_state == frame_state_map_.end()) {
-    NOTREACHED();
+    // TODO(creis): Diagnose.
+    //NOTREACHED();
     return;
   }
   frame_state->second.url = url;
@@ -175,7 +176,8 @@ GURL FrameNavigationState::GetUrl(FrameID frame_id) const {
   FrameIdToStateMap::const_iterator frame_state =
       frame_state_map_.find(frame_id);
   if (frame_state == frame_state_map_.end()) {
-    NOTREACHED();
+    // TODO(creis): Diagnose.
+    //NOTREACHED();
     return GURL();
   }
   if (frame_state->second.is_iframe_srcdoc)
@@ -243,7 +245,10 @@ bool FrameNavigationState::GetParsingFinished(FrameID frame_id) const {
 }
 
 void FrameNavigationState::SetNavigationCommitted(FrameID frame_id) {
-  DCHECK(frame_state_map_.find(frame_id) != frame_state_map_.end());
+  // TODO(creis): Diagnose.
+  if (frame_state_map_.find(frame_id) == frame_state_map_.end())
+    return;
+  //DCHECK(frame_state_map_.find(frame_id) != frame_state_map_.end());
   frame_state_map_[frame_id].is_committed = true;
   if (frame_state_map_[frame_id].is_main_frame)
     main_frame_id_ = frame_id;