win: Remove GetModuleFromAddress, deduplicate __ImageBase code.

base/message_loop/message_loop_unittest.cc

Index: base/message_loop/message_loop_unittest.cc
diff --git a/base/message_loop/message_loop_unittest.cc b/base/message_loop/message_loop_unittest.cc
index a06ba91041aaa8482ea2a7950fa8e7370aebd0e1..7b31214d99fb1a4b7402b68ac38d17e582788009 100644
--- a/base/message_loop/message_loop_unittest.cc
+++ b/base/message_loop/message_loop_unittest.cc
@@ -30,6 +30,7 @@
 #include "base/message_loop/message_pump_win.h"
 #include "base/process/memory.h"
 #include "base/strings/string16.h"
+#include "base/win/current_module.h"
 #include "base/win/scoped_handle.h"
 #endif
 
@@ -923,7 +924,7 @@ LRESULT CALLBACK TestWndProcThunk(HWND hwnd, UINT message,
 
 TEST(MessageLoopTest, AlwaysHaveUserMessageWhenNesting) {
   MessageLoop loop(MessageLoop::TYPE_UI);
-  HINSTANCE instance = GetModuleFromAddress(&TestWndProcThunk);
+  HINSTANCE instance = CURRENT_MODULE();
   WNDCLASSEX wc = {0};
   wc.cbSize = sizeof(wc);
   wc.lpfnWndProc = TestWndProcThunk;