Use UtilityProcessHost to patch files.

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 fa59340a8b646a323f0adfdf28aeafbee6d9febf..bd9e37b4f0a420293d7c0475c1a1bd8baab9512b 100644
--- a/chrome/browser/component_updater/component_updater_service.h
+++ b/chrome/browser/component_updater/component_updater_service.h
@@ -30,7 +30,6 @@ class ResourceThrottle;
 namespace component_updater {
 
 class OnDemandTester;
-class ComponentPatcher;
 
 // Component specific installers must derive from this class and implement
 // OnUpdateError() and Install(). A valid instance of this class must be
@@ -178,9 +177,6 @@ class ComponentUpdateService {
     virtual net::URLRequestContextGetter* RequestContext() = 0;
     // True means that all ops are performed in this process.
     virtual bool InProcess() = 0;
-    // Creates a new ComponentPatcher in a platform-specific way. This is useful
-    // for dependency injection.
-    virtual ComponentPatcher* CreateComponentPatcher() = 0;
     // True means that this client can handle delta updates.
     virtual bool DeltasEnabled() const = 0;
     // True means that the background downloader can be used for downloading