Disable modifying extensions when in managed mode.

chrome/browser/extensions/management_policy.h

 // Copyright (c) 2012 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_MANAGEMENT_POLICY_H_
 #define CHROME_BROWSER_EXTENSIONS_MANAGEMENT_POLICY_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 28 matching lines @@
   //
   // For all of the Provider methods below, if |error| is not NULL and the
   // method imposes a restriction on the desired action, |error| may be set
   // to an applicable error message, but this is not required.
   class Provider {
    public:
     Provider() {}
     virtual ~Provider() {}
 
     // A human-readable name for this provider, for use in debug messages.
-    virtual std::string GetPolicyProviderName() const = 0;
+    // Implementers should return an empty string in non-debug builds, to save
+    // executable size.
+    virtual std::string GetDebugPolicyProviderName() const = 0;
 
     // Providers should return false if a user may not install the |extension|,
     // or load or run it if it has already been installed.
     virtual bool UserMayLoad(const Extension* extension,
                              string16* error) const;
 
     // Providers should return false if a user may not enable, disable, or
     // uninstall the |extension|, or change its usage options (incognito
     // permission, file access, etc.).
     virtual bool UserMayModifySettings(const Extension* extension,
@@ skipping 43 matching lines @@
  private:
   typedef std::set<Provider*> ProviderList;
   ProviderList providers_;
 
   DISALLOW_COPY_AND_ASSIGN(ManagementPolicy);
 };
 
 }  // namespace
 
 #endif  // CHROME_BROWSER_EXTENSIONS_MANAGEMENT_POLICY_H_