Use UtilityProcessHost to patch files.

chrome/browser/component_updater/component_unpacker.cc

Index: chrome/browser/component_updater/component_unpacker.cc
diff --git a/chrome/browser/component_updater/component_unpacker.cc b/chrome/browser/component_updater/component_unpacker.cc
index 43ed68ab043b2b6a064ee4382491ce490becabf1..c35b421d4671d53b70388e8793a4b76ab359e6a5 100644
--- a/chrome/browser/component_updater/component_unpacker.cc
+++ b/chrome/browser/component_updater/component_unpacker.cc
@@ -98,15 +98,15 @@ 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)
     : pk_hash_(pk_hash),
       path_(path),
       is_delta_(false),
       fingerprint_(fingerprint),
-      patcher_(patcher),
       installer_(installer),
+      in_process_(in_process),
       error_(kNone),
       extended_error_(0),
       ptr_factory_(this),
@@ -204,12 +204,14 @@ bool ComponentUnpacker::BeginPatching() {
       error_ = kUnzipPathError;
       return false;
     }
+    patcher_.reset(new ComponentPatcher(unpack_diff_path_,
+                                        unpack_path_,
+                                        installer_,
+                                        in_process_,
+                                        task_runner_));
     task_runner_->PostTask(
-        FROM_HERE, base::Bind(&DifferentialUpdatePatch,
-                              unpack_diff_path_,
-                              unpack_path_,
-                              patcher_,
-                              installer_,
+        FROM_HERE, base::Bind(&ComponentPatcher::Start,
+                              patcher_->GetWeakPtr(),
                               base::Bind(&ComponentUnpacker::EndPatching,
                                          GetWeakPtr())));
   } else {
@@ -223,6 +225,7 @@ bool ComponentUnpacker::BeginPatching() {
 }
 
 void ComponentUnpacker::EndPatching(Error error, int extended_error) {
+  patcher_.reset();
   error_ = error;
   extended_error_ = extended_error;
   if (error_ != kNone) {