Rename VulkanViewer to Viewer, take 2.

tools/vulkan/win/VulkanTestContext_win.h

Index: tools/vulkan/win/VulkanTestContext_win.h
diff --git a/tools/vulkan/win/VulkanTestContext_win.h b/tools/vulkan/win/VulkanTestContext_win.h
deleted file mode 100644
index 59b5c2cfd6b4f23befe2fb5eed088a267f2ff222..0000000000000000000000000000000000000000
--- a/tools/vulkan/win/VulkanTestContext_win.h
+++ /dev/null
@@ -1,24 +0,0 @@
-
-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#ifndef VULKANTESTCONTEXT_WIN_DEFINED
-#define VULKANTESTCONTEXT_WIN_DEFINED
-
-#ifdef SK_VULKAN
-
-#include <windows.h>
-#include "../VulkanTestContext.h"
-
-// for Windows
-struct ContextPlatformData_win {
-    HINSTANCE fHInstance;
-    HWND      fHWnd;
-};
-
-#endif // SK_VULKAN
-
-#endif