win: Remove GetModuleFromAddress, deduplicate __ImageBase code.

base/process/memory_win.cc

Index: base/process/memory_win.cc
diff --git a/base/process/memory_win.cc b/base/process/memory_win.cc
index 979a66e193d45862f60a11756885b1d2ad07dd9b..e539c6a35e0e55a1a8609f647ed11f9ab1cab5db 100644
--- a/base/process/memory_win.cc
+++ b/base/process/memory_win.cc
@@ -60,17 +60,6 @@ void EnableTerminationOnOutOfMemory() {
   _set_new_mode(1);
 }
 
-HMODULE GetModuleFromAddress(void* address) {
-  HMODULE instance = NULL;
-  if (!::GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
-                            GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
-                            static_cast<char*>(address),
-                            &instance)) {
-    NOTREACHED();
-  }
-  return instance;
-}
-
 // Implemented using a weak symbol.
 bool UncheckedMalloc(size_t size, void** result) {
   *result = malloc_unchecked(size);