Convert //ppapi to use std::unique_ptr

chrome/browser/renderer_host/pepper/chrome_browser_pepper_host_factory.h

 // 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.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_PEPPER_CHROME_BROWSER_PEPPER_HOST_FACTORY_H_
 #define CHROME_BROWSER_RENDERER_HOST_PEPPER_CHROME_BROWSER_PEPPER_HOST_FACTORY_H_
 
 #include "base/macros.h"
 #include "ppapi/host/host_factory.h"
 
 namespace content {
 class BrowserPpapiHost;
 }  // namespace content
 
 class ChromeBrowserPepperHostFactory : public ppapi::host::HostFactory {
  public:
   // Non-owning pointer to the filter must outlive this class.
   explicit ChromeBrowserPepperHostFactory(content::BrowserPpapiHost* host);
   ~ChromeBrowserPepperHostFactory() override;
 
-  scoped_ptr<ppapi::host::ResourceHost> CreateResourceHost(
+  std::unique_ptr<ppapi::host::ResourceHost> CreateResourceHost(

[dcheng, 2016/04/06 19:57:02]

I ended up changing this too since it's a HostFactory override.

Guiding rules for #includes that I use:

1. Implementation and test .cc files do not need to duplicate headers included
in the 'primary' header.
2. If a class declared in a header has a parent class, the header does not need
to duplicate headers included by the parent class's header when the only
reference is for overriding methods from that parent class. Thus, in this case,
since the only reference is to override a method from HostFactory, no #include
for <memory> is added.

       ppapi::host::PpapiHost* host,
       PP_Resource resource,
       PP_Instance instance,
       const IPC::Message& message) override;
 
  private:
   // Non-owning pointer.
   content::BrowserPpapiHost* host_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserPepperHostFactory);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_PEPPER_CHROME_BROWSER_PEPPER_HOST_FACTORY_H_