Support asynchronous patching operations in the component updater.

chrome/browser/component_updater/component_updater_service.h

Index: chrome/browser/component_updater/component_updater_service.h
diff --git a/chrome/browser/component_updater/component_updater_service.h b/chrome/browser/component_updater/component_updater_service.h
index 551167d2ebb489dd579dc4b72b0b5bc5c8484dbc..a53866fc04276afb48761cdc2883ddc44a232d91 100644
--- a/chrome/browser/component_updater/component_updater_service.h
+++ b/chrome/browser/component_updater/component_updater_service.h
@@ -23,16 +23,13 @@ class URLRequestContextGetter;
 class URLRequest;
 }
 
-namespace component_updater {
-class OnDemandTester;
-}
-
 namespace content {
 class ResourceThrottle;
 }
 
 namespace component_updater {
 
+class OnDemandTester;
 class ComponentPatcher;
 
 // Component specific installers must derive from this class and implement