Change GLGetProcAddress typedef to function returning function pointer

ui/gl/wgl_api_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <memory>
 
 #include "base/command_line.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface_wgl.h"
 #include "ui/gl/gl_wgl_api_implementation.h"
 
 typedef std::pair<std::string, std::string> stringpair;
 
 namespace gl {
 
 class WGLApiTest : public testing::Test {
  public:
   void SetUp() override {
     GLSurfaceWGL::InitializeOneOffForTesting();
     fake_arb_extension_string_ = "";
     fake_ext_extension_string_ = "";
 
     g_driver_wgl.ClearBindings();
     g_driver_wgl.fn.wglGetExtensionsStringARBFn = &FakeGetExtensionsStringARB;
     g_driver_wgl.fn.wglGetExtensionsStringEXTFn = &FakeGetExtensionsStringEXT;
     SetGLImplementation(kGLImplementationDesktopGL);
-    SetGLGetProcAddressProc(
-        static_cast<GLGetProcAddressProc>(&FakeGLGetProcAddress));
+    SetGLGetProcAddressProc(&FakeGLGetProcAddress);
   }
 
   void TearDown() override {
     g_current_wgl_context = nullptr;
     api_.reset(nullptr);
     g_driver_wgl.ClearBindings();
 
     fake_ext_extension_string_ = "";
     fake_arb_extension_string_ = "";
   }
@@ skipping 18 matching lines @@
 
   stringpair GetExtensions() {
     auto stringify = [](const char* str) -> std::string {
       return str ? str : "";
     };
     return stringpair(
         stringify(wglGetExtensionsStringARB(NULL)),
         stringify(wglGetExtensionsStringEXT()));
   }
 
-  static void* GL_BINDING_CALL FakeGLGetProcAddress(const char *proc) {
+  static GLFunctionPointerType WINAPI FakeGLGetProcAddress(const char* proc) {
     return NULL;
   }
 
   static const char* GL_BINDING_CALL FakeGetExtensionsStringARB(HDC dc) {
     return fake_arb_extension_string_;
   }
 
   static const char* GL_BINDING_CALL FakeGetExtensionsStringEXT() {
     return fake_ext_extension_string_;
   }
@@ skipping 66 matching lines @@
   InitializeAPI(nullptr);
   EXPECT_EQ(stringpair(kFakeExtensions, kFakeExtensions),
             GetExtensions());
 
   InitializeAPI(&command_line);
   EXPECT_EQ(stringpair(kFilteredExtensions, kFilteredExtensions),
             GetExtensions());
 }
 
 }  // namespace gl