Cleaned up unused methods from WebStateImpl and NavigationContextImpl.

ios/web/web_state/web_state_impl.mm

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/web_state/web_state_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 147 matching lines @@
 
 CRWWebController* WebStateImpl::GetWebController() {
   return web_controller_;
 }
 
 void WebStateImpl::SetWebController(CRWWebController* web_controller) {
   [web_controller_ close];
   web_controller_.reset([web_controller retain]);
 }
 
-void WebStateImpl::OnNavigationCommitted(const GURL& url) {
-  std::unique_ptr<NavigationContext> context =
-      NavigationContextImpl::CreateNavigationContext(this, url,
-                                                     GetHttpResponseHeaders());
-  for (auto& observer : observers_)
-    observer.DidFinishNavigation(context.get());
-}
-
-void WebStateImpl::OnSameDocumentNavigation(const GURL& url) {
-  std::unique_ptr<NavigationContext> context =
-      NavigationContextImpl::CreateSameDocumentNavigationContext(this, url);
-  for (auto& observer : observers_)
-    observer.DidFinishNavigation(context.get());
-}
-
-void WebStateImpl::OnErrorPageNavigation(const GURL& url) {
-  std::unique_ptr<NavigationContext> context =
-      NavigationContextImpl::CreateErrorPageNavigationContext(
-          this, url, GetHttpResponseHeaders());
-  for (auto& observer : observers_)
-    observer.DidFinishNavigation(context.get());
-}
-
 void WebStateImpl::OnTitleChanged() {
   for (auto& observer : observers_)
     observer.TitleWasSet();
 }
 
 void WebStateImpl::OnVisibleSecurityStateChange() {
   for (auto& observer : observers_)
     observer.DidChangeVisibleSecurityState();
 }
 
@@ skipping 531 matching lines @@
     const LoadCommittedDetails& load_details) {
   for (auto& observer : observers_)
     observer.NavigationItemCommitted(load_details);
 }
 
 WebState* WebStateImpl::GetWebState() {
   return this;
 }
 
 }  // namespace web