Cleaned up unused methods from WebStateImpl and NavigationContextImpl.

ios/web/public/test/fakes/test_web_state_observer.mm

 // Copyright 2017 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.
 
 #include "ios/web/public/test/fakes/test_web_state_observer.h"
 
 #include "base/memory/ptr_util.h"
 #include "ios/web/public/web_state/navigation_context.h"
 #include "ios/web/public/web_state/web_state.h"
 #include "ios/web/web_state/navigation_context_impl.h"
@@ skipping 47 matching lines @@
   navigation_items_pruned_info_->web_state = web_state();
   navigation_items_pruned_info_->count = pruned_item_count;
 }
 
 void TestWebStateObserver::NavigationItemChanged() {
   navigation_item_changed_info_ =
       base::MakeUnique<web::TestNavigationItemChangedInfo>();
   navigation_item_changed_info_->web_state = web_state();
 }
 
-void TestWebStateObserver::DidFinishNavigation(NavigationContext* context) {
+void TestWebStateObserver::DidFinishNavigation(NavigationContext* navigation) {
+  ASSERT_TRUE(!navigation->IsErrorPage() || !navigation->IsSameDocument());
   did_finish_navigation_info_ =
       base::MakeUnique<web::TestDidFinishNavigationInfo>();
   did_finish_navigation_info_->web_state = web_state();
-  if (context->IsSameDocument()) {
-    ASSERT_FALSE(context->IsErrorPage());
-    did_finish_navigation_info_->context =
-        NavigationContextImpl::CreateSameDocumentNavigationContext(
-            context->GetWebState(), context->GetUrl());
-  } else if (context->IsErrorPage()) {
-    ASSERT_FALSE(context->IsSameDocument());
-    did_finish_navigation_info_->context =
-        NavigationContextImpl::CreateErrorPageNavigationContext(
-            context->GetWebState(), context->GetUrl(),
-            context->GetResponseHeaders());
-  } else {
-    did_finish_navigation_info_->context =
-        NavigationContextImpl::CreateNavigationContext(
-            context->GetWebState(), context->GetUrl(),
-            context->GetResponseHeaders());
-  }
+  std::unique_ptr<web::NavigationContextImpl> context =
+      web::NavigationContextImpl::CreateNavigationContext(
+          navigation->GetWebState(), navigation->GetUrl());
+  context->SetIsSameDocument(navigation->IsSameDocument());
+  context->SetIsErrorPage(navigation->IsErrorPage());
+  did_finish_navigation_info_->context = std::move(context);
 }
 
 void TestWebStateObserver::TitleWasSet() {
   title_was_set_info_ = base::MakeUnique<web::TestTitleWasSetInfo>();
   title_was_set_info_->web_state = web_state();
 }
 
 void TestWebStateObserver::DidChangeVisibleSecurityState() {
   did_change_visible_security_state_info_ =
       base::MakeUnique<web::TestDidChangeVisibleSecurityStateInfo>();
@@ skipping 54 matching lines @@
   start_loading_info_ = base::MakeUnique<web::TestStartLoadingInfo>();
   start_loading_info_->web_state = web_state();
 }
 
 void TestWebStateObserver::DidStopLoading() {
   stop_loading_info_ = base::MakeUnique<web::TestStopLoadingInfo>();
   stop_loading_info_->web_state = web_state();
 }
 
 }  // namespace web