Improve timing of frame attach/detach (see #3664)

- Move frame attachment from RenderFrameCreated to
  DidCommitProvisionalLoad. This has a number of advantages:
  - Significantly reduces the frequency of disconnects by avoiding
    the GetInterface/DidCommitNavigation race condition.
  - Stops connecting temporary frames (created during cross-origin
    navigation), making callback behavior more consistent.
- Split frame detach and destruction notifications into separate
  callbacks. OnFrameDetached now reflects a potentially recoverable
  state. Add a new OnFrameDestroyed callback for the unrecoverable
  destruction state.

libcef/browser/frame_service_base.h

@@ -69,7 +69,10 @@ class CefFrameServiceBase : public Interface,
     DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
 
     if (render_frame_host == render_frame_host_) {
-      DVLOG(1) << __func__ << ": RenderFrameHost destroyed.";
+      DVLOG(1) << __func__ << ": "
+               << frame_util::GetFrameDebugString(
+                      render_frame_host->GetGlobalFrameToken())
+               << " destroyed";
       if (receiver_.is_bound()) {
         receiver_.ResetWithReason(
             static_cast<uint32_t>(frame_util::ResetReason::kDeleted),