Fix compiler errors in cc/resources/resource_update.h on Windows

    FAILED: ninja -t msvc -o obj\webkit\renderer\compositor_bindings\webkit_compositor_bindings.web_external_texture_layer_impl.obj -e environment.x86 -- cl.exe /nologo /showIncludes /FC @obj\webkit\renderer\compositor_bindings\webkit_compositor_bindings.web_external_texture_layer_impl.obj.rsp /c ..\..\webkit\renderer\compositor_bindings\web_external_texture_layer_impl.cc /Foobj\webkit\renderer\compositor_bindings\webkit_compositor_bindings.web_external_texture_layer_impl.obj /Fdobj\webkit\renderer\compositor_bindings\webkit_compositor_bindings.pdb
    vendor\chromium\src\skia\ext\refptr.h(65) : error C2027: use of undefined type 'SkCanvas'
            vendor\chromium\src\third_party\skia\include\core\skdrawlooper.h(15) : see declaration of 'SkCanvas'
            vendor\chromium\src\skia\ext\refptr.h(64) : while compiling class template member function 'skia::RefPtr<T> &skia::RefPtr<T>::operator =(const skia::RefPtr<T> &)'
            with
            [
                T=SkCanvas
            ]
            vendor\chromium\src\cc\resources\resource_update.h(38) : see reference to class template instantiation 'skia::RefPtr<T>' being compiled
            with
            [
                T=SkCanvas
            ]
    vendor\chromium\src\skia\ext\refptr.h(65) : error C2227: left of '->ref' must point to class/struct/union/generic type
    vendor\chromium\src\skia\ext\refptr.h(65) : error C2027: use of undefined type 'SkCanvas'
            vendor\chromium\src\third_party\skia\include\core\skdrawlooper.h(15) : see declaration of 'SkCanvas'
    vendor\chromium\src\skia\ext\refptr.h(65) : error C2227: left of '->unref' must point to class/struct/union/generic type