Change GLGetProcAddress typedef to function returning function pointer

ui/gl/wgl_api_unittest.cc

Index: ui/gl/wgl_api_unittest.cc
diff --git a/ui/gl/wgl_api_unittest.cc b/ui/gl/wgl_api_unittest.cc
index 65fed3241ff71746066eae3f12a20c7baf4be548..041d3dfaf9f1de54aa5f29a75982ad6551a86e43 100644
--- a/ui/gl/wgl_api_unittest.cc
+++ b/ui/gl/wgl_api_unittest.cc
@@ -25,8 +25,7 @@ class WGLApiTest : public testing::Test {
     g_driver_wgl.fn.wglGetExtensionsStringARBFn = &FakeGetExtensionsStringARB;
     g_driver_wgl.fn.wglGetExtensionsStringEXTFn = &FakeGetExtensionsStringEXT;
     SetGLImplementation(kGLImplementationDesktopGL);
-    SetGLGetProcAddressProc(
-        static_cast<GLGetProcAddressProc>(&FakeGLGetProcAddress));
+    SetGLGetProcAddressProc(&FakeGLGetProcAddress);
   }
 
   void TearDown() override {
@@ -65,7 +64,7 @@ class WGLApiTest : public testing::Test {
         stringify(wglGetExtensionsStringEXT()));
   }
 
-  static void* GL_BINDING_CALL FakeGLGetProcAddress(const char *proc) {
+  static GLFunctionPointerType WINAPI FakeGLGetProcAddress(const char* proc) {
     return NULL;
   }