Fix several problems with the content verification code

extensions/browser/content_verifier_delegate.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_VERIFIER_DELEGATE_H_
 #define EXTENSIONS_BROWSER_CONTENT_VERIFIER_DELEGATE_H_
 
 #include <set>
 
 #include "url/gurl.h"
 
 namespace base {
 class FilePath;
 class Version;
 }
 
 namespace extensions {
 
 class Extension;
 
 // A pointer to the bytes of a public key, and the number of bytes.
 struct ContentVerifierKey {
   const uint8* data;
   int size;
 
+  ContentVerifierKey() : data(NULL), size(0) {}
+
   ContentVerifierKey(const uint8* data, int size) {
     this->data = data;
     this->size = size;
   }
 };
 
 // This is an interface for clients that want to use a ContentVerifier.
 class ContentVerifierDelegate {
  public:
   virtual ~ContentVerifierDelegate() {}
@@ skipping 19 matching lines @@
       const extensions::Extension* extension) = 0;
 
   // Called when the content verifier detects that a read of a file inside
   // an extension did not match its expected hash.
   virtual void VerifyFailed(const std::string& extension_id) = 0;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_CONTENT_VERIFIER_DELEGATE_H_