Support asynchronous patching operations in the component updater.

chrome/browser/component_updater/default_component_installer.cc

Index: chrome/browser/component_updater/default_component_installer.cc
diff --git a/chrome/browser/component_updater/default_component_installer.cc b/chrome/browser/component_updater/default_component_installer.cc
index d1b699b638334c282c01f0b6f654ed7249906115..4faffa852965e90034ebc2914b79f20264d7a327 100644
--- a/chrome/browser/component_updater/default_component_installer.cc
+++ b/chrome/browser/component_updater/default_component_installer.cc
@@ -152,7 +152,7 @@ void DefaultComponentInstaller::StartRegistration(
     // FinishRegistration().
     base::ReadFileToString(latest_dir.AppendASCII("manifest.fingerprint"),
                            &current_fingerprint_);
-    current_manifest_= ReadManifest(latest_dir);
+    current_manifest_= component_updater::ReadManifest(latest_dir);
     if (!current_manifest_) {
       DLOG(ERROR) << "Failed to read manifest for "
                   << installer_traits_->GetName() << " ("