Merge to M59: Only skip certain hidden elements at MHTML serialization

chrome/browser/download/save_page_browsertest.cc

Index: chrome/browser/download/save_page_browsertest.cc
diff --git a/chrome/browser/download/save_page_browsertest.cc b/chrome/browser/download/save_page_browsertest.cc
index 444de2fddfd708bd10e645f01585e075af9098e4..80b0006368c0cbffff2fe8d94a521a78ec748392 100644
--- a/chrome/browser/download/save_page_browsertest.cc
+++ b/chrome/browser/download/save_page_browsertest.cc
@@ -1304,9 +1304,9 @@ IN_PROC_BROWSER_TEST_P(SavePageOriginalVsSavedComparisonTest, Style) {
 
   GURL url(embedded_test_server()->GetURL("a.com", "/save_page/style.htm"));
 
-  // The original page has 7 iframes. 2 of them are both hidden and affecting
-  // no layout. So these two are excluded from the saved page.
-  TestOriginalVsSavedPage(save_page_type, url, 7, 5, expected_substrings);
+  // The original page has 7 iframes. One of them that contains hidden attribute
+  // will be excluded from the saved page.
+  TestOriginalVsSavedPage(save_page_type, url, 7, 6, expected_substrings);
 }
 
 // Test for saving a page with broken subresources: