Removed dead code from NavigationManagerImpl::GetIndexForOffset.

ios/web/navigation/navigation_manager_impl_unittest.mm

Index: ios/web/navigation/navigation_manager_impl_unittest.mm
diff --git a/ios/web/navigation/navigation_manager_impl_unittest.mm b/ios/web/navigation/navigation_manager_impl_unittest.mm
index 7bac7552ab46256554b5a441339fd7f0aba2b974..ed28bf6401549fa0dd7e542a34e8f667e8d8b658 100644
--- a/ios/web/navigation/navigation_manager_impl_unittest.mm
+++ b/ios/web/navigation/navigation_manager_impl_unittest.mm
@@ -169,27 +169,6 @@ TEST_F(NavigationManagerTest, CanGoBackWithMultipleCommitedItems) {
   EXPECT_TRUE(navigation_manager()->CanGoToOffset(-1));
 }
 
-// Tests that going forward or positive offset is not possible if there is a
-// pending entry.
-TEST_F(NavigationManagerTest, CanGoForwardWithPendingItem) {
-  navigation_manager()->AddPendingItem(
-      GURL("http://www.url.com"), Referrer(), ui::PAGE_TRANSITION_TYPED,
-      web::NavigationInitiationType::USER_INITIATED);
-  [session_controller() commitPendingItem];
-  navigation_manager()->AddPendingItem(
-      GURL("http://www.url.com/0"), Referrer(), ui::PAGE_TRANSITION_TYPED,
-      web::NavigationInitiationType::USER_INITIATED);
-  [session_controller() commitPendingItem];
-  [session_controller() goToItemAtIndex:0];
-  navigation_manager()->AddPendingItem(
-      GURL("http://www.url.com/1"), Referrer(), ui::PAGE_TRANSITION_TYPED,
-      web::NavigationInitiationType::USER_INITIATED);
-
-  // Pending entry should not allow going forward.
-  EXPECT_FALSE(navigation_manager()->CanGoForward());
-  EXPECT_FALSE(navigation_manager()->CanGoToOffset(1));
-}
-
 // Tests that going forward or positive offset is not possible without a
 // committed item.
 TEST_F(NavigationManagerTest, CanGoForwardWithoutCommitedItem) {