win: Remove GetModuleFromAddress, deduplicate __ImageBase code.

base/base_paths_win.cc

Index: base/base_paths_win.cc
diff --git a/base/base_paths_win.cc b/base/base_paths_win.cc
index 58f925f7e1f69d06529a1f7489faea656ce7285b..7102f7487533e696240352f62380ed7b6029422f 100644
--- a/base/base_paths_win.cc
+++ b/base/base_paths_win.cc
@@ -10,12 +10,10 @@
 #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 {
@@ -39,8 +37,7 @@ bool PathProviderWin(int key, FilePath* result) {
     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;