Stop offline page resource throttle from intercepting non http(s) urls

chrome/browser/android/offline_pages/downloads/resource_throttle.cc

Index: chrome/browser/android/offline_pages/downloads/resource_throttle.cc
diff --git a/chrome/browser/android/offline_pages/downloads/resource_throttle.cc b/chrome/browser/android/offline_pages/downloads/resource_throttle.cc
index a09b33c4abf26c70f13b2834710a8b659e385148..ee6aec8c702f1dfd0ea6a899ba3b019f13d9023f 100644
--- a/chrome/browser/android/offline_pages/downloads/resource_throttle.cc
+++ b/chrome/browser/android/offline_pages/downloads/resource_throttle.cc
@@ -13,11 +13,13 @@
 #include "net/base/mime_util.h"
 
 namespace {
-// Mime type of download resource that should trigger handoff to OfflinePages
-// backend for full page load and snapshot.
-bool CanDownloadAsOfflinePage(const std::string& contents_mime_type) {
-  return net::MatchesMimeType(contents_mime_type, "text/html") ||
-         net::MatchesMimeType(contents_mime_type, "application/xhtml+xml");
+// Check if the url and mime type of a download resource should trigger handoff
+// to OfflinePages backend for full page load and snapshot.
+bool CanDownloadAsOfflinePage(
+    const GURL& url, const std::string& contents_mime_type) {
+  return url.SchemeIsHTTPOrHTTPS() &&
+      (net::MatchesMimeType(contents_mime_type, "text/html") ||
+          net::MatchesMimeType(contents_mime_type, "application/xhtml+xml"));
 }
 
 void WillStartOfflineRequestOnUIThread(
@@ -49,7 +51,8 @@ void ResourceThrottle::WillProcessResponse(bool* defer) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   std::string mime_type;
   request_->GetMimeType(&mime_type);
-  if (CanDownloadAsOfflinePage(mime_type)) {
+
+  if (CanDownloadAsOfflinePage(request_->url(), mime_type)) {
     const content::ResourceRequestInfo* info =
         content::ResourceRequestInfo::ForRequest(request_);
     if (!info)