Cleanup the extensions code to avoid the duplication that was introduced in the quick fix to turn t…

runtime/bin/extensions_win.cc

Index: runtime/bin/extensions_win.cc
diff --git a/runtime/bin/extensions_win.cc b/runtime/bin/extensions_win.cc
index 33e3273cd95ab4d235aba404e5df8d7aed18569c..d3b49f2a98839d6b011529e332fc80fcb8487ac3 100644
--- a/runtime/bin/extensions_win.cc
+++ b/runtime/bin/extensions_win.cc
@@ -2,7 +2,6 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#include "platform/assert.h"
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
@@ -17,38 +16,25 @@ namespace bin {
 const char* kPrecompiledLibraryName = "precompiled.dll";
 const char* kPrecompiledSymbolName = "_kInstructionsSnapshot";
 
-Dart_Handle Extensions::LoadExtensionLibrary(const char* library_file,
-                                             void** library_handle) {
-  ASSERT(library_handle != NULL);
-  *library_handle = LoadLibraryW(StringUtilsWin::Utf8ToWide(library_file));
-  if (*library_handle == NULL) {
-    OSError err;
-    return Dart_NewApiError(err.message());
-  }
-  return Dart_Null();
-}
-
 void* Extensions::LoadExtensionLibrary(const char* library_file) {
+  SetLastError(0);
   return LoadLibraryW(StringUtilsWin::Utf8ToWide(library_file));
 }
 
-Dart_Handle Extensions::ResolveSymbol(void* lib_handle,
-                                      const char* symbol,
-                                      void** init_function) {
-  ASSERT(init_function != NULL);
-  *init_function = GetProcAddress(
-      reinterpret_cast<HMODULE>(lib_handle), symbol);
-  if (*init_function == NULL) {
+void* Extensions::ResolveSymbol(void* lib_handle, const char* symbol) {
+  SetLastError(0);
+  return GetProcAddress(reinterpret_cast<HMODULE>(lib_handle), symbol);
+}
+
+Dart_Handle Extensions::GetError() {
+  int last_error = GetLastError();
+  if (last_error != 0) {
     OSError err;
     return Dart_NewApiError(err.message());
   }
   return Dart_Null();
 }
 
-void* Extensions::ResolveSymbol(void* lib_handle, const char* symbol) {
-  return GetProcAddress(reinterpret_cast<HMODULE>(lib_handle), symbol);
-}
-
 }  // namespace bin
 }  // namespace dart