Coalesce more hardcoded schemes to using predefined constants.

chrome/browser/extensions/extension.h

 // Copyright (c) 2006-2008 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_H_
 
 #include <string>
 #include <vector>
 
 #include "base/file_path.h"
 #include "base/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "chrome/browser/extensions/user_script_master.h"
 #include "googleurl/src/gurl.h"
 
-// The URL schemes Chromium extensions and user scripts are served from. These
-// really should be in extension_protocols.h, but that causes link errors on
-// linux because extension_protocols.cc refers to undefined symbols.
-// TODO(aa): Move these back to extension_protocols.h when more of Linux and
-// Mac are up and running.
-extern const char kExtensionURLScheme[];
-extern const char kUserScriptURLScheme[];
-
 // Represents a Chromium extension.
 class Extension {
  public:
   Extension() {}
   explicit Extension(const FilePath& path);
 
   // The format for extension manifests that this code understands.
   static const unsigned int kExpectedFormatVersion = 1;
 
   // The name of the manifest inside an extension.
@@ skipping 117 matching lines @@
 
   // A SHA1 hash of the contents of the zip file.  Note that this key is only
   // present in the manifest that's prepended to the zip.  The inner manifest
   // will not have this key.
   std::string zip_hash_;
 
   DISALLOW_COPY_AND_ASSIGN(Extension);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_H_