Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/browser/renderer_host/render_frame_host_impl.cc

Index: content/browser/renderer_host/render_frame_host_impl.cc
diff --git a/content/browser/renderer_host/render_frame_host_impl.cc b/content/browser/renderer_host/render_frame_host_impl.cc
index d6b7ed54691a6937624d592177d0420e25565a80..d972f4c2bba6bf4b80e525980d682f95ef998c12 100644
--- a/content/browser/renderer_host/render_frame_host_impl.cc
+++ b/content/browser/renderer_host/render_frame_host_impl.cc
@@ -11,6 +11,7 @@
 #include "content/common/frame_messages.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
+#include "content/public/browser/site_instance.h"
 
 namespace content {
 
@@ -37,6 +38,7 @@ RenderFrameHostImpl::RenderFrameHostImpl(
     bool is_swapped_out)
     : render_view_host_(render_view_host),
       frame_tree_(frame_tree),
+      navigator_(frame_tree->navigator()),
       routing_id_(routing_id),
       is_swapped_out_(is_swapped_out) {
   GetProcess()->AddRoute(routing_id_, this);
@@ -76,6 +78,13 @@ RenderProcessHost* RenderFrameHostImpl::GetProcess() const {
   return render_view_host_->GetProcess();
 }
 
+SiteInstance* RenderFrameHostImpl::GetSiteInstance() const {
+  // TODO(nasko): This should return the RenderFrameHostImpl's SiteInstance,
+  // but it is not implemented yet, so return the one for the associated
+  // RenderViewHost.
+  return render_view_host_->GetSiteInstance();
+}
+
 void RenderFrameHostImpl::OnCreateChildFrame(int new_frame_routing_id,
                                              int64 parent_frame_id,
                                              int64 frame_id,