win: Remove GetModuleFromAddress, deduplicate __ImageBase code.

base/win/message_window.cc

Index: base/win/message_window.cc
diff --git a/base/win/message_window.cc b/base/win/message_window.cc
index 381b1b167bbae91a2965b6941c16565c71cd33d9..26b64a533887e0e619d7b50a4d36f2de69d6303e 100644
--- a/base/win/message_window.cc
+++ b/base/win/message_window.cc
@@ -7,7 +7,7 @@
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/macros.h"
-#include "base/process/memory.h"
+#include "base/win/current_module.h"
 #include "base/win/wrapped_window_proc.h"
 
 const wchar_t kMessageWindowClassName[] = L"Chrome_MessageWindow";
@@ -36,8 +36,7 @@ static LazyInstance<MessageWindow::WindowClass> g_window_class =
     LAZY_INSTANCE_INITIALIZER;
 
 MessageWindow::WindowClass::WindowClass()
-    : atom_(0),
-      instance_(base::GetModuleFromAddress(&MessageWindow::WindowProc)) {
+    : atom_(0), instance_(CURRENT_MODULE()) {
   WNDCLASSEX window_class;
   window_class.cbSize = sizeof(window_class);
   window_class.style = 0;