Use SameDocument instead of SamePage term on iOS.

ios/web/web_state/web_state_impl_unittest.mm

 // Copyright 2014 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 <memory>
 
@@ skipping 374 matching lines @@
   ASSERT_TRUE(observer->load_page_info());
   EXPECT_EQ(web_state_.get(), observer->load_page_info()->web_state);
   EXPECT_FALSE(observer->load_page_info()->success);
   web_state_->OnPageLoaded(url, true);
   ASSERT_TRUE(observer->load_page_info());
   EXPECT_EQ(web_state_.get(), observer->load_page_info()->web_state);
   EXPECT_TRUE(observer->load_page_info()->success);
 
   // Test that DidFinishNavigation() is called for same page navigations.
   ASSERT_FALSE(observer->did_finish_navigation_info());
-  web_state_->OnSamePageNavigation(url);
+  web_state_->OnSameDocumentNavigation(url);
   ASSERT_TRUE(observer->did_finish_navigation_info());
   EXPECT_EQ(web_state_.get(),
             observer->did_finish_navigation_info()->web_state);
   NavigationContext* context =
       observer->did_finish_navigation_info()->context.get();
   ASSERT_TRUE(context);
   EXPECT_EQ(url, context->GetUrl());
   EXPECT_TRUE(context->IsSameDocument());
   EXPECT_FALSE(context->IsErrorPage());
 
@@ skipping 269 matching lines @@
   // Check that a false return value is forwarded correctly.
   EXPECT_FALSE(
       web_state_->OnScriptCommandReceived(kCommand2, value_2, kUrl2, false));
   EXPECT_FALSE(is_called_1);
   EXPECT_TRUE(is_called_2);
 
   web_state_->RemoveScriptCommandCallback(kPrefix2);
 }
 
 }  // namespace web