Use UtilityProcessHost to patch files.

chrome/browser/component_updater/component_unpacker.h

Index: chrome/browser/component_updater/component_unpacker.h
diff --git a/chrome/browser/component_updater/component_unpacker.h b/chrome/browser/component_updater/component_unpacker.h
index ce722807d8e38dbd630c852e79d22233606076dd..c84282b15d48af6751605fee73bb1dab5325f4a0 100644
--- a/chrome/browser/component_updater/component_unpacker.h
+++ b/chrome/browser/component_updater/component_unpacker.h
@@ -94,16 +94,15 @@ class ComponentUnpacker {
   ComponentUnpacker(const std::vector<uint8>& pk_hash,
                     const base::FilePath& path,
                     const std::string& fingerprint,
-                    ComponentPatcher* patcher,
                     ComponentInstaller* installer,
+                    bool in_process,
                     scoped_refptr<base::SequencedTaskRunner> task_runner);
 
   virtual ~ComponentUnpacker();
 
   // Begins the actual unpacking of the files. May invoke a patcher if the
   // package is a differential update. Calls |callback| with the result.
-  void Unpack(
-      const base::Callback<void(Error, int)>& callback);
+  void Unpack(const base::Callback<void(Error, int)>& callback);
 
  private:
   bool UnpackInternal();
@@ -144,9 +143,10 @@ class ComponentUnpacker {
   base::FilePath unpack_diff_path_;
   bool is_delta_;
   std::string fingerprint_;
-  ComponentPatcher* patcher_;
+  scoped_ptr<ComponentPatcher> patcher_;
   ComponentInstaller* installer_;
   base::Callback<void(Error, int)> callback_;
+  bool in_process_;

[Sorin Jianu, 2014/02/03 20:57:57]

const?

[waffles, 2014/02/07 01:00:59]

Done.

   Error error_;
   int extended_error_;
   base::WeakPtrFactory<ComponentUnpacker> ptr_factory_;