Convert DistillabilityDriver to use the new navigation callbacks.

components/dom_distiller/content/browser/distillability_driver.cc

Index: components/dom_distiller/content/browser/distillability_driver.cc
diff --git a/components/dom_distiller/content/browser/distillability_driver.cc b/components/dom_distiller/content/browser/distillability_driver.cc
index ad9785433ba70a3c5513b7c8e86df1178528b9f3..8d5b06e6d6b475a41003a897a9ffcb67cacb3c5a 100644
--- a/components/dom_distiller/content/browser/distillability_driver.cc
+++ b/components/dom_distiller/content/browser/distillability_driver.cc
@@ -5,6 +5,7 @@
 #include "components/dom_distiller/content/browser/distillability_driver.h"
 
 #include "base/memory/ptr_util.h"
+#include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
@@ -88,10 +89,10 @@ void DistillabilityDriver::RenderFrameHostChanged(
   SetupMojoService(new_host);
 }
 
-void DistillabilityDriver::DidStartProvisionalLoadForFrame(
-    content::RenderFrameHost* render_frame_host, const GURL& validated_url,
-    bool is_error_page) {
-  SetupMojoService(render_frame_host);
+void DistillabilityDriver::ReadyToCommitNavigation(
+      content::NavigationHandle* navigation_handle) {
+  if (!navigation_handle->IsSamePage())
+    SetupMojoService(navigation_handle->GetRenderFrameHost());
 }
 
 void DistillabilityDriver::SetupMojoService(