s/IsSamePage/IsSameDocument for NavigationContext.

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

Index: ios/web/public/test/fakes/test_web_state_observer.mm
diff --git a/ios/web/public/test/fakes/test_web_state_observer.mm b/ios/web/public/test/fakes/test_web_state_observer.mm
index e0784cf18785a5c39ec9d17f412c1ec3285b3109..cd34dc530d582029200e76e1832434c19f2b3adc 100644
--- a/ios/web/public/test/fakes/test_web_state_observer.mm
+++ b/ios/web/public/test/fakes/test_web_state_observer.mm
@@ -68,13 +68,13 @@ void TestWebStateObserver::DidFinishNavigation(NavigationContext* context) {
   did_finish_navigation_info_ =
       base::MakeUnique<web::TestDidFinishNavigationInfo>();
   did_finish_navigation_info_->web_state = web_state();
-  if (context->IsSamePage()) {
+  if (context->IsSameDocument()) {
     ASSERT_FALSE(context->IsErrorPage());
     did_finish_navigation_info_->context =
         NavigationContextImpl::CreateSamePageNavigationContext(
             context->GetWebState(), context->GetUrl());
   } else if (context->IsErrorPage()) {
-    ASSERT_FALSE(context->IsSamePage());
+    ASSERT_FALSE(context->IsSameDocument());
     did_finish_navigation_info_->context =
         NavigationContextImpl::CreateErrorPageNavigationContext(
             context->GetWebState(), context->GetUrl());