[ios] Removed canGoBack/canGoForward API from CRWSessionController.

ios/web/navigation/crw_session_controller_unittest.mm

 // Copyright 2012 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/navigation/crw_session_controller.h"
 
 #import <Foundation/Foundation.h>
 
 #include <utility>
 
@@ skipping 670 matching lines @@
   ASSERT_EQ(1, [session_controller_ currentNavigationIndex]);
   ASSERT_EQ(2, [session_controller_ previousNavigationIndex]);
 
   // Go forward 1 entry.
   EXPECT_TRUE([session_controller_ canGoDelta:1]);
   [session_controller_ goDelta:1];
   ASSERT_EQ(2, [session_controller_ currentNavigationIndex]);
   ASSERT_EQ(1, [session_controller_ previousNavigationIndex]);
 }
 
-TEST_F(CRWSessionControllerTest, CanGoBackWithoutCommitedEntry) {
-  EXPECT_FALSE([session_controller_ canGoBack]);
-  EXPECT_FALSE([session_controller_ canGoDelta:-1]);
-}
-
-// Tests that |canGoBack| returns NO if there is a transient entry, but no
-// committed entries.
-TEST_F(CRWSessionControllerTest, CanGoBackWithTransientEntry) {
-  [session_controller_ addTransientEntryWithURL:GURL("http://www.url.com")];
-
-  EXPECT_FALSE([session_controller_ canGoBack]);
-}
-
-// Tests that |canGoBack| returns YES if there is a transient entry and at least
-// one committed entry.
-TEST_F(CRWSessionControllerTest, CanGoBackWithTransientEntryAndCommittedEntry) {
-  [session_controller_ addPendingEntry:GURL("http://www.url.com")
-                              referrer:MakeReferrer("http://www.referer.com")
-                            transition:ui::PAGE_TRANSITION_TYPED
-                     rendererInitiated:NO];
-  [session_controller_ commitPendingEntry];
-  [session_controller_ addTransientEntryWithURL:GURL("http://www.url.com")];
-
-  EXPECT_TRUE([session_controller_ canGoBack]);
-}
-
-TEST_F(CRWSessionControllerTest, CanGoBackWithSingleCommitedEntry) {
-  [session_controller_
-        addPendingEntry:GURL("http://www.url.com")
-               referrer:MakeReferrer("http://www.referer.com")
-             transition:ui::PAGE_TRANSITION_TYPED
-      rendererInitiated:NO];
-  [session_controller_ commitPendingEntry];
-
-  EXPECT_FALSE([session_controller_ canGoBack]);
-  EXPECT_FALSE([session_controller_ canGoDelta:-1]);
-}
-
-TEST_F(CRWSessionControllerTest, CanGoForwardWithoutCommitedEntry) {
-  EXPECT_FALSE([session_controller_ canGoForward]);
-  EXPECT_FALSE([session_controller_ canGoDelta:1]);
-}
-
-TEST_F(CRWSessionControllerTest, CanGoForwardWithSingleCommitedEntry) {
-  [session_controller_
-        addPendingEntry:GURL("http://www.url.com")
-               referrer:MakeReferrer("http://www.referer.com")
-             transition:ui::PAGE_TRANSITION_TYPED
-      rendererInitiated:NO];
-  [session_controller_ commitPendingEntry];
-
-  EXPECT_FALSE([session_controller_ canGoForward]);
-  EXPECT_FALSE([session_controller_ canGoDelta:1]);
-}
-
 // Helper to create a NavigationItem. Caller is responsible for freeing
 // the memory.
 web::NavigationItem* CreateNavigationItem(const std::string& url,
                                           const std::string& referrer,
                                           NSString* title) {
   web::Referrer referrer_object(GURL(referrer),
                                 web::ReferrerPolicyDefault);
   web::NavigationItemImpl* navigation_item = new web::NavigationItemImpl();
   navigation_item->SetURL(GURL(url));
   navigation_item->SetReferrer(referrer_object);
@@ skipping 461 matching lines @@
 
   [session_controller_ setPendingEntryIndex:0];
 
   web::NavigationItem* visible_item =
       [[session_controller_ visibleEntry] navigationItem];
   ASSERT_TRUE(visible_item);
   EXPECT_EQ("http://www.example.com/0", visible_item->GetURL().spec());
 }
 
 }  // anonymous namespace