<chromium> [backport] Add support for file origins to url::Origin.

BUG=

Change-Id: I0339e88207543f9229bf3df086e1daea7ce5c855
Committed: https://crrev.com/b27713e1dd922d7501860506a281901b6a47bfb8
Cr-Commit-Position: refs/heads/master@{#305593}
Reviewed-by: Michael Brüning <[email protected]>

Author: Kai Koehne

chromium/url/origin.cc

@@ -13,7 +13,7 @@ Origin::Origin() : string_("null") {}
 Origin::Origin(const std::string& origin) : string_(origin) {
   DCHECK(origin == "null" || MatchPattern(origin, "?*://?*"));
   DCHECK_GT(origin.size(), 0u);
-  DCHECK_NE(origin[origin.size() - 1], '/');
+  DCHECK(origin == "file://" || origin[origin.size() - 1] != '/');
 }
 
 }  // namespace url