Drop all uses of //base except ObserverList from view mgr client lib

mojo/services/view_manager/public/cpp/lib/view_manager_context.cc

 // Copyright 2014 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 "view_manager/public/cpp/view_manager_context.h"
 
 #include "mojo/public/cpp/application/application_impl.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "window_manager/public/interfaces/window_manager.mojom.h"
 
@@ skipping 10 matching lines @@
   WindowManager* wm() { return wm_.get(); }
 
  private:
   WindowManagerPtr wm_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(InternalState);
 };
 
 ViewManagerContext::ViewManagerContext(ApplicationImpl* application_impl)
     : state_(new InternalState(application_impl)) {}
-ViewManagerContext::~ViewManagerContext() {}
+ViewManagerContext::~ViewManagerContext() {
+  delete state_;
+}
 
 void ViewManagerContext::Embed(const String& url) {
   Embed(url, nullptr, nullptr);
 }
 
 void ViewManagerContext::Embed(const String& url,
                                InterfaceRequest<ServiceProvider> services,
                                ServiceProviderPtr exposed_services) {
   state_->wm()->Embed(url, services.Pass(), exposed_services.Pass());
 }
 
 }  // namespace mojo