Differential updates for components.

chrome/browser/component_updater/pnacl/pnacl_component_installer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/component_updater/pnacl/pnacl_component_installer.h"
 
 #include "base/base_paths.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 293 matching lines @@
   // for now). TODO(jvoung): we need notifications if someone surfed to a
   // Pnacl webpage and Pnacl was just installed at this time. They should
   // then be able to reload the page and retry (or something).
   // See: http://code.google.com/p/chromium/issues/detail?id=107438
   set_current_version(version);
 
   PathService::Override(chrome::DIR_PNACL_COMPONENT, path);
   return true;
 }
 
+bool PnaclComponentInstaller::GetInstalledFile(
+    const std::string& file, base::FilePath* installed_file) {
+  return false;
+}
+
 namespace {
 
 void DoCheckForUpdate(ComponentUpdateService* cus,
                    const CrxComponent& pnacl) {
   if (cus->CheckForUpdateSoon(pnacl) != ComponentUpdateService::kOk) {
     LOG(WARNING) << "Pnacl check for update failed.";
   }
 }
 
 // Finally, do the registration with the right version number.
@@ skipping 104 matching lines @@
   // No need to check the commandline flags again here.
   // We could only have gotten here after RegisterPnaclComponent
   // found --enable-pnacl, since that is where we create the profile_observer_,
   // which in turn calls ReRegisterPnacl.
   DCHECK(per_user_);
   // Figure out profile information, before proceeding to look for files.
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&GetProfileInformation, this));
 }