Differential updates for components.

chrome/browser/component_updater/widevine_cdm_component_installer.cc

Index: chrome/browser/component_updater/widevine_cdm_component_installer.cc
===================================================================
--- chrome/browser/component_updater/widevine_cdm_component_installer.cc	(revision 201835)
+++ chrome/browser/component_updater/widevine_cdm_component_installer.cc	(working copy)
@@ -194,6 +194,9 @@
   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:
   base::Version current_version_;
 };
@@ -245,6 +248,11 @@
   return true;
 }
 
+bool WidevineCdmComponentInstaller::GetInstalledFile(
+    const std::string& file, base::FilePath* installed_file) {
+  return false;
+}
+
 void FinishWidevineCdmUpdateRegistration(ComponentUpdateService* cus,
                                          const base::Version& version) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));