Use SameDocument instead of SamePage term on iOS.

ios/web/web_state/ui/crw_web_controller.mm

Index: ios/web/web_state/ui/crw_web_controller.mm
diff --git a/ios/web/web_state/ui/crw_web_controller.mm b/ios/web/web_state/ui/crw_web_controller.mm
index e23141e1fb0ba7a4916fff43a41a8033ca04ef90..d735546b7182aeb4e2acb3c62dd4bc474c4472da 100644
--- a/ios/web/web_state/ui/crw_web_controller.mm
+++ b/ios/web/web_state/ui/crw_web_controller.mm
@@ -1310,7 +1310,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
   [[self sessionController] pushNewItemWithURL:pageURL
                                    stateObject:stateObject
                                     transition:transition];
-  _webStateImpl->OnSamePageNavigation(pageURL);
+  _webStateImpl->OnSameDocumentNavigation(pageURL);
   self.userInteractionRegistered = NO;
 }
 
@@ -1318,7 +1318,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
                     stateObject:(NSString*)stateObject {
   [[self sessionController] updateCurrentItemWithURL:pageURL
                                          stateObject:stateObject];
-  _webStateImpl->OnSamePageNavigation(pageURL);
+  _webStateImpl->OnSameDocumentNavigation(pageURL);
 }
 
 - (void)setDocumentURL:(const GURL&)newURL {
@@ -4732,7 +4732,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
     [self setDocumentURL:webViewURL];
     [self webPageChanged];
     if (isSameDocumentNavigation) {
-      _webStateImpl->OnSamePageNavigation(webViewURL);
+      _webStateImpl->OnSameDocumentNavigation(webViewURL);
     } else {
       _webStateImpl->OnNavigationCommitted(webViewURL);
     }
@@ -4888,7 +4888,7 @@ const NSTimeInterval kSnapshotOverlayTransition = 0.5;
 
   if (!_changingHistoryState) {
     [self didStartLoadingURL:_documentURL];
-    _webStateImpl->OnSamePageNavigation(newURL);
+    _webStateImpl->OnSameDocumentNavigation(newURL);
     [self updateSSLStatusForCurrentNavigationItem];
     [self didFinishNavigation];
   }