Differential updates for components.

chrome/browser/component_updater/recovery_component_installer.cc

Index: chrome/browser/component_updater/recovery_component_installer.cc
===================================================================
--- chrome/browser/component_updater/recovery_component_installer.cc	(revision 201835)
+++ chrome/browser/component_updater/recovery_component_installer.cc	(working copy)
@@ -56,6 +56,9 @@
   virtual bool Install(const base::DictionaryValue& manifest,
                        const base::FilePath& unpack_path) OVERRIDE;
 
+  virtual bool GetInstalledFile(const std::string& file,
+                                base::FilePath* installed_file) OVERRIDE;
+
  private:
   Version current_version_;
   PrefService* prefs_;
@@ -130,6 +133,11 @@
   return base::LaunchProcess(cmdline, base::LaunchOptions(), NULL);
 }
 
+bool RecoveryComponentInstaller::GetInstalledFile(
+    const std::string& file, base::FilePath* installed_file) {
+  return false;
+}
+
 void RegisterRecoveryComponent(ComponentUpdateService* cus,
                                PrefService* prefs) {
 #if !defined(OS_CHROMEOS)