Move kStandardSchemeSeparator from //content to //url

This constant is used in code shared by iOS, and is general enough to be placed
in //url.

TBR=benm,yoz

Review URL: https://codereview.chromium.org/319613002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275055 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/subscribe_page_action_browsertest.cc b/chrome/browser/extensions/subscribe_page_action_browsertest.cc
index f0a65153..79752964 100644
--- a/chrome/browser/extensions/subscribe_page_action_browsertest.cc
+++ b/chrome/browser/extensions/subscribe_page_action_browsertest.cc
@@ -66,7 +66,7 @@
     // We navigate directly to the subscribe page for feeds where the feed
     // sniffing won't work, in other words, as is the case for malformed feeds.
     return GURL(std::string(extensions::kExtensionScheme) +
-        content::kStandardSchemeSeparator +
+        url::kStandardSchemeSeparator +
         extension_id + std::string(kSubscribePage) + std::string("?") +
         feed_url.spec() + std::string("&synchronous"));
   } else {