Move Webstore URL concepts to //extensions

extensions/common/extensions_client.h

Index: extensions/common/extensions_client.h
diff --git a/extensions/common/extensions_client.h b/extensions/common/extensions_client.h
index 623a2de9e60f7ef3020666f4679a17d02853a29c..77037d4b38f92951b4169b7e6a155219194573f1 100644
--- a/extensions/common/extensions_client.h
+++ b/extensions/common/extensions_client.h
@@ -97,6 +97,16 @@ class ExtensionsClient {
   // (i.e., only logged) or allowed (i.e., logged before crashing).
   virtual bool ShouldSuppressFatalErrors() const = 0;
 
+  // Returns the base webstore URL prefix.
+  virtual std::string GetWebstoreBaseURL() const = 0;
+
+  // Returns the URL to use for update manifest queries.
+  virtual std::string GetWebstoreUpdateURL() const = 0;
+
+  // Returns a flag indicating whether or not a given URL is a valid
+  // extension blacklist URL.
+  virtual bool IsBlacklistUpdateURL(const GURL& url) const = 0;
+
   // Return the extensions client.
   static ExtensionsClient* Get();