Componentize component_updater: Move some paths/constants to component.

chrome/browser/component_updater/update_checker.h

Index: chrome/browser/component_updater/update_checker.h
diff --git a/chrome/browser/component_updater/update_checker.h b/chrome/browser/component_updater/update_checker.h
index b43e2fc23a5ea44eb8f7fb66489c354618c7cdf7..200f869b3457ce40b3d976beb78d8c330063cc70 100644
--- a/chrome/browser/component_updater/update_checker.h
+++ b/chrome/browser/component_updater/update_checker.h
@@ -36,6 +36,8 @@ class UpdateChecker {
   // provides a way to customize the <request> element. This value is inserted
   // as-is, therefore it must be well-formed as an XML attribute string.
   virtual bool CheckForUpdates(
+      const std::string& chrome_version,
+      const std::string& platform_name,
       const std::vector<CrxUpdateItem*>& items_to_check,
       const std::string& additional_attributes) = 0;