Split the private webstore install API into two parts....

chrome/browser/extensions/extension_function_dispatcher.cc

 // Copyright (c) 2010 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/extensions/extension_function_dispatcher.h"
 
 #include <map>
 
 #include "base/process_util.h"
 #include "base/singleton.h"
@@ skipping 264 matching lines @@
   // Management.
   RegisterFunction<GetAllExtensionsFunction>();
   RegisterFunction<GetExtensionByIdFunction>();
   RegisterFunction<LaunchAppFunction>();
   RegisterFunction<SetEnabledFunction>();
   RegisterFunction<UninstallFunction>();
 
   // WebstorePrivate.
   RegisterFunction<GetBrowserLoginFunction>();
   RegisterFunction<GetStoreLoginFunction>();
-  RegisterFunction<InstallFunction>();
   RegisterFunction<SetStoreLoginFunction>();
   RegisterFunction<PromptBrowserLoginFunction>();
+  RegisterFunction<BeginInstallFunction>();
+  RegisterFunction<CompleteInstallFunction>();
 }
 
 void FactoryRegistry::GetAllNames(std::vector<std::string>* names) {
   for (FactoryMap::iterator iter = factories_.begin();
        iter != factories_.end(); ++iter) {
     names->push_back(iter->first);
   }
 }
 
 bool FactoryRegistry::OverrideFunction(const std::string& name,
@@ skipping 190 matching lines @@
   } else {
     NOTREACHED();
     base::KillProcess(render_view_host_->process()->GetHandle(),
                       ResultCodes::KILLED_BAD_MESSAGE, false);
   }
 }
 
 Profile* ExtensionFunctionDispatcher::profile() {
   return profile_;
 }