Move AlterEnvironment to base/environment.h, implement on Windows.

content/browser/renderer_host/render_process_host_impl.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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 493 matching lines @@
     cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
 
     // Spawn the child process asynchronously to avoid blocking the UI thread.
     // As long as there's no renderer prefix, we can use the zygote process
     // at this stage.
     child_process_launcher_.reset(new ChildProcessLauncher(
 #if defined(OS_WIN)
         new RendererSandboxedProcessLauncherDelegate,
 #elif defined(OS_POSIX)
         renderer_prefix.empty(),
-        base::EnvironmentVector(),
+        base::EnvironmentMap(),
         channel_->TakeClientFileDescriptor(),
 #endif
         cmd_line,
         GetID(),
         this));
 
     fast_shutdown_started_ = false;
   }
 
   if (!gpu_observer_registered_) {
@@ skipping 1245 matching lines @@
     // Skip widgets in other processes.
     if (widgets[i]->GetProcess()->GetID() != GetID())
       continue;
 
     RenderViewHost* rvh = RenderViewHost::From(widgets[i]);
     rvh->UpdateWebkitPreferences(rvh->GetWebkitPreferences());
   }
 }
 
 }  // namespace content