Allow loading MHTML archive from http/https schemes

third_party/WebKit/Source/platform/mhtml/MHTMLArchive.cpp

Index: third_party/WebKit/Source/platform/mhtml/MHTMLArchive.cpp
diff --git a/third_party/WebKit/Source/platform/mhtml/MHTMLArchive.cpp b/third_party/WebKit/Source/platform/mhtml/MHTMLArchive.cpp
index b735d6e72d3f94d24dde674345e261666e9ca871..26fe8ab4d8e1b3b88d67c43482a0c6c3288da1db 100644
--- a/third_party/WebKit/Source/platform/mhtml/MHTMLArchive.cpp
+++ b/third_party/WebKit/Source/platform/mhtml/MHTMLArchive.cpp
@@ -69,8 +69,9 @@ MHTMLArchive::MHTMLArchive()
 
 MHTMLArchive* MHTMLArchive::create(const KURL& url, PassRefPtr<SharedBuffer> data)
 {
-    // For security reasons we only load MHTML pages from local URLs.
-    if (!SchemeRegistry::shouldTreatURLSchemeAsLocal(url.protocol()))
+    // MHTML pages can only be loaded from local URLs and http/https URLs.
+    // The latter is now allowed due to full sandboxing enforcement on MHTML pages.
+    if (!SchemeRegistry::shouldTreatURLSchemeAsLocal(url.protocol()) && !url.protocolIsInHTTPFamily())
         return nullptr;
 
     MHTMLParser parser(data);