win: Remove GetModuleFromAddress, deduplicate __ImageBase code.

base/base_paths_win.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.
 
 #include <windows.h>
 #include <shlobj.h>
 
 #include "base/base_paths.h"
 #include "base/environment.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/win/current_module.h"
 #include "base/win/scoped_co_mem.h"
 #include "base/win/windows_version.h"
 
-// http://blogs.msdn.com/oldnewthing/archive/2004/10/25/247180.aspx
-extern "C" IMAGE_DOS_HEADER __ImageBase;
-
 using base::FilePath;
 
 namespace base {
 
 bool PathProviderWin(int key, FilePath* result) {
   // We need to go compute the value. It would be nice to support paths with
   // names longer than MAX_PATH, but the system functions don't seem to be
   // designed for it either, with the exception of GetTempPath (but other
   // things will surely break if the temp path is too long, so we don't bother
   // handling it.
   wchar_t system_buffer[MAX_PATH];
   system_buffer[0] = 0;
 
   FilePath cur;
   switch (key) {
     case base::FILE_EXE:
       if (GetModuleFileName(NULL, system_buffer, MAX_PATH) == 0)
         return false;
       cur = FilePath(system_buffer);
       break;
     case base::FILE_MODULE: {
       // the resource containing module is assumed to be the one that
       // this code lives in, whether that's a dll or exe
-      HMODULE this_module = reinterpret_cast<HMODULE>(&__ImageBase);
-      if (GetModuleFileName(this_module, system_buffer, MAX_PATH) == 0)
+      if (GetModuleFileName(CURRENT_MODULE(), system_buffer, MAX_PATH) == 0)
         return false;
       cur = FilePath(system_buffer);
       break;
     }
     case base::DIR_WINDOWS:
       GetWindowsDirectory(system_buffer, MAX_PATH);
       cur = FilePath(system_buffer);
       break;
     case base::DIR_SYSTEM:
       GetSystemDirectory(system_buffer, MAX_PATH);
@@ skipping 134 matching lines @@
       break;
     default:
       return false;
   }
 
   *result = cur;
   return true;
 }
 
 }  // namespace base