Kill PhabricatorFileURI

Summary:
we used to need this function for security purposes, but no longer need
it.   remove it so that some call sites can be optimized via smarter data
fetching, and so the whole codebase can have one less thing in it.

Test Plan:
verified the images displayed properly for each of the following
- viewed a diff with added images.
- viewed a user feed
- viewed a user profile
- viewed all image macros
- viewed a paste and clicked through "raw link"
weakness in testing around proxy files and transformed files.  not sure what
these are.  changes here are very programmatic however.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, btrahan, epriestley

Maniphest Tasks: T672

Differential Revision: https://secure.phabricator.com/D1354

src/applications/files/controller/proxy/PhabricatorFileProxyController.php

@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * Copyright 2012 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -52,7 +52,16 @@ class PhabricatorFileProxyController extends PhabricatorFileController {
     }
 
     if ($proxy) {
-      $view_uri = PhabricatorFileURI::getViewURIForPHID($proxy->getFilePHID());
+      $file = id(new PhabricatorFile())->loadOneWhere('phid = %s',
+                                                      $proxy->getFilePHID());
+      if ($file) {
+        $view_uri = $file->getBestURI();
+      } else {
+        $bad_phid = $proxy->getFilePHID();
+        throw new Exception(
+          "Unable to load file with phid {$bad_phid}."
+        );
+      }
       return id(new AphrontRedirectResponse())->setURI($view_uri);
     }