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

content/browser/child_process_launcher.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 CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_
 #define CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/process/kill.h"
@@ skipping 23 matching lines @@
   // Launches the process asynchronously, calling the client when the result is
   // ready.  Deleting this object before the process is created is safe, since
   // the callback won't be called.  If the process is still running by the time
   // this object destructs, it will be terminated.
   // Takes ownership of cmd_line.
   ChildProcessLauncher(
 #if defined(OS_WIN)
       SandboxedProcessLauncherDelegate* delegate,
 #elif defined(OS_POSIX)
       bool use_zygote,
-      const base::EnvironmentVector& environ,
+      const base::EnvironmentMap& environ,
       int ipcfd,
 #endif
       CommandLine* cmd_line,
       int child_process_id,
       Client* client);
   ~ChildProcessLauncher();
 
   // True if the process is being launched and so the handle isn't available.
   bool IsStarting();
 
@@ skipping 21 matching lines @@
   class Context;
 
   scoped_refptr<Context> context_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildProcessLauncher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_