Differential updates for components.

chrome/browser/component_updater/widevine_cdm_component_installer.cc

Index: chrome/browser/component_updater/widevine_cdm_component_installer.cc
diff --git a/chrome/browser/component_updater/widevine_cdm_component_installer.cc b/chrome/browser/component_updater/widevine_cdm_component_installer.cc
index 822aff251bc0b055eb12b64fc5c5a1c5648a6440..8bc3feff3eb36b62cbff0a79e7057ef370cc35b2 100644
--- a/chrome/browser/component_updater/widevine_cdm_component_installer.cc
+++ b/chrome/browser/component_updater/widevine_cdm_component_installer.cc
@@ -195,6 +195,9 @@ class WidevineCdmComponentInstaller : public ComponentInstaller {
   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_;
 };
@@ -246,6 +249,11 @@ bool WidevineCdmComponentInstaller::Install(
   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));