Remove deprecated navigation callbacks on WebContentsObserver that are now unused.

content/test/web_contents_observer_sanity_checker.cc

Index: content/test/web_contents_observer_sanity_checker.cc
diff --git a/content/test/web_contents_observer_sanity_checker.cc b/content/test/web_contents_observer_sanity_checker.cc
index ae9af67dc0e60f3940fa47bb76bd591838b4b08f..66c371c8c9057961e0f3d0dd2ede55d333802b61 100644
--- a/content/test/web_contents_observer_sanity_checker.cc
+++ b/content/test/web_contents_observer_sanity_checker.cc
@@ -209,42 +209,6 @@ void WebContentsObserverSanityChecker::DidFinishNavigation(
   ongoing_navigations_.erase(navigation_handle);
 }
 
-void WebContentsObserverSanityChecker::DidStartProvisionalLoadForFrame(
-    RenderFrameHost* render_frame_host,
-    const GURL& validated_url,
-    bool is_error_page) {
-  AssertRenderFrameExists(render_frame_host);
-}
-
-void WebContentsObserverSanityChecker::DidCommitProvisionalLoadForFrame(
-    RenderFrameHost* render_frame_host,
-    const GURL& url,
-    ui::PageTransition transition_type) {
-  AssertRenderFrameExists(render_frame_host);
-}
-
-void WebContentsObserverSanityChecker::DidFailProvisionalLoad(
-    RenderFrameHost* render_frame_host,
-    const GURL& validated_url,
-    int error_code,
-    const base::string16& error_description,
-    bool was_ignored_by_handler) {
-  AssertRenderFrameExists(render_frame_host);
-}
-
-void WebContentsObserverSanityChecker::DidNavigateMainFrame(
-    const LoadCommittedDetails& details,
-    const FrameNavigateParams& params) {
-  AssertMainFrameExists();
-}
-
-void WebContentsObserverSanityChecker::DidNavigateAnyFrame(
-    RenderFrameHost* render_frame_host,
-    const LoadCommittedDetails& details,
-    const FrameNavigateParams& params) {
-  AssertRenderFrameExists(render_frame_host);
-}
-
 void WebContentsObserverSanityChecker::DocumentAvailableInMainFrame() {
   AssertMainFrameExists();
 }