Optimize GetExtensionOrAppIDByURL

When the function reaches this point in the code, then
url.SchemeIs(kExtensionScheme) was false.
So the condition will remain false in GetExtensionOrAppByURL,
which makes this method equivalent to GetHostedAppByURL.
Save some cycles by calling GetHostedAppByURL directly.

Contributed by Rob Wu <rob@robwu.nl>

BUG=

Review URL: https://codereview.chromium.org/167493003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251811 0039d316-1c4b-4281-b951-d872f2087c98

extensions/common/extension_set.cc

@@ -75,7 +75,7 @@ std::string ExtensionSet::GetExtensionOrAppIDByURL(const GURL& url) const {
   if (url.SchemeIs(kExtensionScheme))
     return url.host();
 
-  const Extension* extension = GetExtensionOrAppByURL(url);
+  const Extension* extension = GetHostedAppByURL(url);
   if (!extension)
     return std::string();