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

ppapi/cpp/dev/resource_array_dev.h

Index: ppapi/cpp/dev/resource_array_dev.h
diff --git a/ppapi/cpp/dev/resource_array_dev.h b/ppapi/cpp/dev/resource_array_dev.h
index 1d5a25fda7495045347d3caadde24f6c29fe9d72..9d9635cf5480ed2a4f0f1b9a09b832ee0039df44 100644
--- a/ppapi/cpp/dev/resource_array_dev.h
+++ b/ppapi/cpp/dev/resource_array_dev.h
@@ -10,19 +10,17 @@
 
 namespace pp {
 
-class Instance;
+class InstanceHandle;
 
 class ResourceArray_Dev : public Resource {
  public:
   ResourceArray_Dev();
 
-  struct PassRef {};
-
   ResourceArray_Dev(PassRef, PP_Resource resource);
 
   ResourceArray_Dev(const ResourceArray_Dev& other);
 
-  ResourceArray_Dev(Instance* instance,
+  ResourceArray_Dev(const InstanceHandle& instance,
                     const PP_Resource elements[],
                     uint32_t size);