Exempt Save-Data header from CORS preflight request check

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 819c6d762d630d07043ba8769677e472c2ffb63b..0da138b1caffc0d6487d59aeb8a064e426720634 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -695,6 +695,14 @@ void CreateWebUsbPermissionBubble(
 }
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS)
 
+bool GetDataSaverEnabledPref(const PrefService* prefs) {
+  // Enable data saver only when data saver pref is enabled and not part of
+  // "Disabled" group of "SaveDataHeader" experiment.
+  return prefs->GetBoolean(prefs::kDataSaverEnabled) &&
+         base::FieldTrialList::FindFullName("SaveDataHeader")
+             .compare("Disabled");
+}
+
 }  // namespace
 
 ChromeContentBrowserClient::ChromeContentBrowserClient()
@@ -2379,8 +2387,7 @@ void ChromeContentBrowserClient::OverrideWebkitPrefs(
     web_prefs->strict_powerful_feature_restrictions = true;
   }
 
-  web_prefs->data_saver_enabled =
-      prefs->GetBoolean(prefs::kDataSaverEnabled);
+  web_prefs->data_saver_enabled = GetDataSaverEnabledPref(prefs);
 
   for (size_t i = 0; i < extra_parts_.size(); ++i)
     extra_parts_[i]->OverrideWebkitPrefs(rvh, web_prefs);