Remove //chrome deps from ExtensionDownloader

chrome/browser/extensions/chrome_extensions_browser_client.h

Index: chrome/browser/extensions/chrome_extensions_browser_client.h
diff --git a/chrome/browser/extensions/chrome_extensions_browser_client.h b/chrome/browser/extensions/chrome_extensions_browser_client.h
index 413ddbbf50d6ff7f9d08f2e93eb877e634f69839..9d01136c807d889e0f708d06c5dea2783c855217 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.h
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.h
@@ -97,6 +97,9 @@ class ChromeExtensionsBrowserClient : public ExtensionsBrowserClient {
       scoped_ptr<base::ListValue> args) override;
   virtual net::NetLog* GetNetLog() override;
   virtual ExtensionCache* GetExtensionCache() override;
+  virtual bool IsBackgroundUpdateAllowed() override;
+  virtual bool IsMinBrowserVersionSupported(
+      const std::string& min_version) override;
 
  private:
   friend struct base::DefaultLazyInstanceTraits<ChromeExtensionsBrowserClient>;