Fix several problems with the content verification code

extensions/browser/content_verify_job.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EXTENSIONS_BROWSER_CONTENT_VERIFY_JOB_H_
 #define EXTENSIONS_BROWSER_CONTENT_VERIFY_JOB_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 16 matching lines @@
 // Objects of this class are responsible for verifying that the actual content
 // read from an extension file matches an expected set of hashes. This class
 // can be created on any thread but the rest of the methods should be called
 // from only one thread.
 class ContentVerifyJob : public base::RefCountedThreadSafe<ContentVerifyJob> {
  public:
   enum FailureReason {
     // No failure.
     NONE,
 
-    // Failed because there were no expected hashes.
-    NO_HASHES,
+    // Failed because there were no expected hashes at all (eg they haven't
+    // been fetched yet).
+    MISSING_ALL_HASHES,
+
+    // Failed because this file wasn't found in the list of expected hashes.
+    NO_HASHES_FOR_FILE,
 
     // Some of the content read did not match the expected hash.
     HASH_MISMATCH
   };
   typedef base::Callback<void(FailureReason)> FailureCallback;
 
   // The |failure_callback| will be called at most once if there was a failure.
   ContentVerifyJob(ContentHashReader* hash_reader,
                    const FailureCallback& failure_callback);
 
@@ skipping 69 matching lines @@
   // Called once if verification fails.
   FailureCallback failure_callback_;
 
   // For ensuring methods on called on the right thread.
   base::ThreadChecker thread_checker_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_CONTENT_VERIFY_JOB_H_