Fix MSVC build (including on 2015), drop some workarounds for MSVC older than 2013.

src/client/windows/tests/crash_generation_app/crash_generation_app.cc

 // Copyright (c) 2008, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 55 matching lines @@
 
 HINSTANCE current_instance;             // Current instance.
 TCHAR title[kMaxLoadString];            // Title bar text.
 TCHAR window_class[kMaxLoadString];     // Main window class name.
 
 ATOM MyRegisterClass(HINSTANCE instance);
 BOOL InitInstance(HINSTANCE, int);
 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
 INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
 
-static int kCustomInfoCount = 2;
+static size_t kCustomInfoCount = 2;
 static CustomInfoEntry kCustomInfoEntries[] = {
     CustomInfoEntry(L"prod", L"CrashTestApp"),
     CustomInfoEntry(L"ver", L"1.0"),
 };
 
 static ExceptionHandler* handler = NULL;
 static CrashGenerationServer* crash_server = NULL;
 
 // Registers the window class.
 //
@@ skipping 426 matching lines @@
   MSG msg;
   while (GetMessage(&msg, NULL, 0, 0)) {
     if (!TranslateAccelerator(msg.hwnd, accel_table, &msg)) {
       TranslateMessage(&msg);
       DispatchMessage(&msg);
     }
   }
 
   return static_cast<int>(msg.wParam);
 }