Cleanup everything but net/ for our first clang plugins.

webkit/plugins/ppapi/resource_tracker.h

Index: webkit/plugins/ppapi/resource_tracker.h
diff --git a/webkit/plugins/ppapi/resource_tracker.h b/webkit/plugins/ppapi/resource_tracker.h
index 32a4c7b19383cab60742836c41c5c7ca99e69fda..1187ddae099d8c39771558980f83de8089b1a06a 100644
--- a/webkit/plugins/ppapi/resource_tracker.h
+++ b/webkit/plugins/ppapi/resource_tracker.h
@@ -103,17 +103,7 @@ class ResourceTracker {
   typedef std::set<int32> VarSet;
 
   // Per-instance data we track.
-  struct InstanceData {
-    InstanceData() : instance(0) {}
-
-    // Non-owning pointer to the instance object. When a PluginInstance is
-    // destroyed, it will notify us and we'll delete all associated data.
-    PluginInstance* instance;
-
-    // Resources and object vars associated with the instance.
-    ResourceSet resources;
-    VarSet object_vars;
-  };
+  struct InstanceData;
 
   // Prohibit creation other then by the Singleton class.
   ResourceTracker();