Convert resources to take an instance key instead of an Instance*.

ppapi/cpp/dev/video_decoder_dev.cc

Index: ppapi/cpp/dev/video_decoder_dev.cc
diff --git a/ppapi/cpp/dev/video_decoder_dev.cc b/ppapi/cpp/dev/video_decoder_dev.cc
index dcc731229074f9fa5c1b1dcf10e36f390a7596bc..92bbe1c6352594d7beb1373b467ac87da3481bb4 100644
--- a/ppapi/cpp/dev/video_decoder_dev.cc
+++ b/ppapi/cpp/dev/video_decoder_dev.cc
@@ -8,7 +8,7 @@
 #include "ppapi/c/dev/ppp_video_decoder_dev.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/cpp/graphics_3d.h"
-#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/module_impl.h"
 
@@ -22,13 +22,13 @@ template <> const char* interface_name<PPB_VideoDecoder_Dev>() {
 
 }  // namespace
 
-VideoDecoder_Dev::VideoDecoder_Dev(const Instance* instance,
+VideoDecoder_Dev::VideoDecoder_Dev(const InstanceHandle& instance,
                                    const Graphics3D& context,
                                    PP_VideoDecoder_Profile profile) {
   if (!has_interface<PPB_VideoDecoder_Dev>())
     return;
   PassRefFromConstructor(get_interface<PPB_VideoDecoder_Dev>()->Create(
-      instance->pp_instance(), context.pp_resource(), profile));
+      instance.pp_instance(), context.pp_resource(), profile));
 }
 
 VideoDecoder_Dev::VideoDecoder_Dev(PP_Resource resource) : Resource(resource) {