Remove //chrome deps from ExtensionDownloader

extensions/browser/extensions_browser_client.h

 // Copyright 2013 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_EXTENSIONS_BROWSER_CLIENT_H_
 #define EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 173 matching lines @@
   // implementation must be safe to call from any thread.
   virtual void BroadcastEventToRenderers(const std::string& event_name,
                                          scoped_ptr<base::ListValue> args) = 0;
 
   // Returns the embedder's net::NetLog.
   virtual net::NetLog* GetNetLog() = 0;
 
   // Gets the single ExtensionCache instance shared across the browser process.
   virtual ExtensionCache* GetExtensionCache() = 0;
 
+  // Indicates whether extension update checks should be allowed.
+  virtual bool IsBackgroundUpdateAllowed() = 0;
+
+  // Indicates whether an extension update which specifies its minimum browser
+  // version as |min_version| can be installed by the client. Not all extensions
+  // embedders share the same versioning model, so interpretation of the string
+  // is left up to the embedder.
+  virtual bool IsMinBrowserVersionSupported(const std::string& min_version) = 0;
+
   // Returns the single instance of |this|.
   static ExtensionsBrowserClient* Get();
 
   // Initialize the single instance.
   static void Set(ExtensionsBrowserClient* client);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_