win: Remove GetModuleFromAddress, deduplicate __ImageBase code.

chrome/child/pdf_child_init.cc

 // Copyright 2015 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 "chrome/child/pdf_child_init.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "build/build_config.h"
 #include "chrome/common/chrome_paths.h"
 #include "content/public/child/child_thread.h"
 
 #if defined(OS_WIN)
+#include "base/win/current_module.h"
 #include "base/win/iat_patch_function.h"
 #endif
 
 namespace chrome {
 namespace {
 #if defined(OS_WIN)
 static base::win::IATPatchFunction g_iat_patch_createdca;
 HDC WINAPI CreateDCAPatch(LPCSTR driver_name,
                           LPCSTR device_name,
                           LPCSTR output,
@@ skipping 32 matching lines @@
       if (content::ChildThread::Get())
         content::ChildThread::Get()->ReleaseCachedFonts();
     }
   }
   return rv;
 }
 #endif  // OS_WIN
 
 }  // namespace
 
-#if defined(OS_WIN)
-// http://blogs.msdn.com/oldnewthing/archive/2004/10/25/247180.aspx
-extern "C" IMAGE_DOS_HEADER __ImageBase;
-#endif  // OS_WIN
-
 void InitializePDF() {
 #if defined(OS_WIN)
   // Need to patch a few functions for font loading to work correctly. This can
   // be removed once we switch PDF to use Skia.
-  HMODULE current_module = reinterpret_cast<HMODULE>(&__ImageBase);
+  HMODULE current_module = CURRENT_MODULE();
   g_iat_patch_createdca.PatchFromModule(current_module, "gdi32.dll",
                                         "CreateDCA", CreateDCAPatch);
   g_iat_patch_get_font_data.PatchFromModule(current_module, "gdi32.dll",
                                             "GetFontData", GetFontDataPatch);
   g_original_get_font_data = reinterpret_cast<GetFontDataPtr>(
       g_iat_patch_get_font_data.original_function());
 #endif  // OS_WIN
 }
 
 }  // namespace chrome