Add extensions code to use common updater in components/update_client/

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 852a27c5d416261d6c88f43d3f7f73030017fc3e..a16f1e4416d461820af1d970fd4ec6685d05b355 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.h
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.h
@@ -5,7 +5,8 @@
 #ifndef CHROME_BROWSER_EXTENSIONS_CHROME_EXTENSIONS_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_EXTENSIONS_CHROME_EXTENSIONS_BROWSER_CLIENT_H_
 
-#include <map>
+#include <string>
+#include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ -110,6 +111,8 @@ class ChromeExtensionsBrowserClient : public ExtensionsBrowserClient {
                       int view_instance_id) override;
   void AttachExtensionTaskManagerTag(content::WebContents* web_contents,
                                      ViewType view_type) override;
+  scoped_refptr<update_client::UpdateClient> CreateUpdateClient(

[Sorin Jianu, 2015/10/02 00:05:10]

Is update_client::UpdateClient declared anywhere?

[asargent_no_longer_on_chrome, 2015/10/06 21:31:17]

It's forward-declared in extensions/browser/extensions_browser_client.h, which
is the abstract class that this one is a concrete implementation of.

So I didn't forward declare again in this file since this is an override method.

[Sorin Jianu, 2015/10/08 22:57:54]

Acknowledged.

+      content::BrowserContext* context) override;
 
  private:
   friend struct base::DefaultLazyInstanceTraits<ChromeExtensionsBrowserClient>;