Use SameDocument instead of SamePage term on iOS.

ios/web/web_state/navigation_context_impl_unittest.mm

Index: ios/web/web_state/navigation_context_impl_unittest.mm
diff --git a/ios/web/web_state/navigation_context_impl_unittest.mm b/ios/web/web_state/navigation_context_impl_unittest.mm
index c9c8a87b830b700947b7b9f84c6ce6630455784b..558a308caa510fa28f19c624132fc552b96337b6 100644
--- a/ios/web/web_state/navigation_context_impl_unittest.mm
+++ b/ios/web/web_state/navigation_context_impl_unittest.mm
@@ -31,10 +31,11 @@ TEST_F(NavigationContextImplTest, NavigationContext) {
   EXPECT_FALSE(context->IsErrorPage());
 }
 
-// Tests CreateSamePageNavigationContext factory method.
-TEST_F(NavigationContextImplTest, SamePageNavigationContext) {
+// Tests CreateSameDocumentNavigationContext factory method.
+TEST_F(NavigationContextImplTest, SameDocumentNavigationContext) {
   std::unique_ptr<NavigationContext> context =
-      NavigationContextImpl::CreateSamePageNavigationContext(&web_state_, url_);
+      NavigationContextImpl::CreateSameDocumentNavigationContext(&web_state_,
+                                                                 url_);
   ASSERT_TRUE(context);
 
   EXPECT_EQ(&web_state_, context->GetWebState());