Deleted OS_WIN and all Windows specific files from base.

base/environment.h

 // Copyright (c) 2011 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 BASE_ENVIRONMENT_H_
 #define BASE_ENVIRONMENT_H_
 
 #include <map>
 #include <string>
 
@@ skipping 29 matching lines @@
 
   // Returns true on success, otherwise returns false.
   virtual bool SetVar(const char* variable_name,
                       const std::string& new_value) = 0;
 
   // Returns true on success, otherwise returns false.
   virtual bool UnSetVar(const char* variable_name) = 0;
 };
 
 
-#if defined(OS_WIN)
-
-typedef string16 NativeEnvironmentString;
-typedef std::map<NativeEnvironmentString, NativeEnvironmentString>
-    EnvironmentMap;
-
-// Returns a modified environment vector constructed from the given environment
-// and the list of changes given in |changes|. Each key in the environment is
-// matched against the first element of the pairs. In the event of a match, the
-// value is replaced by the second of the pair, unless the second is empty, in
-// which case the key-value is removed.
-//
-// This Windows version takes and returns a Windows-style environment block
-// which is a concatenated list of null-terminated 16-bit strings. The end is
-// marked by a double-null terminator. The size of the returned string will
-// include the terminators.
-BASE_EXPORT string16 AlterEnvironment(const wchar_t* env,
-                                      const EnvironmentMap& changes);
-
-#elif defined(OS_POSIX)
+#if defined(OS_POSIX)
 
 typedef std::string NativeEnvironmentString;
 typedef std::map<NativeEnvironmentString, NativeEnvironmentString>
     EnvironmentMap;
 
 // See general comments for the Windows version above.
 //
 // This Posix version takes and returns a Posix-style environment block, which
 // is a null-terminated list of pointers to null-terminated strings. The
 // returned array will have appended to it the storage for the array itself so
 // there is only one pointer to manage, but this means that you can't copy the
 // array without keeping the original around.
 BASE_EXPORT scoped_ptr<char*[]> AlterEnvironment(
     const char* const* env,
     const EnvironmentMap& changes);
 
 #endif
 
 }  // namespace base
 
 #endif  // BASE_ENVIRONMENT_H_