PPAPI: Purposely leak ProxyLock, fix shutdown race

ppapi/shared_impl/test_globals.h

Index: ppapi/shared_impl/test_globals.h
diff --git a/ppapi/shared_impl/test_globals.h b/ppapi/shared_impl/test_globals.h
index 082af34b26c2de457cca0c9f2fb0d82351bfff6a..c2780c3fa418ec1e96c33070a7f14955314493b3 100644
--- a/ppapi/shared_impl/test_globals.h
+++ b/ppapi/shared_impl/test_globals.h
@@ -49,6 +49,8 @@ class TestGlobals : public PpapiGlobals {
   explicit TestGlobals(PpapiGlobals::PerThreadForTest);
   virtual ~TestGlobals();
 
+  void set_proxy_lock(base::Lock* lock) { lock_ = lock; }
+
   // PpapiGlobals implementation.
   virtual ResourceTracker* GetResourceTracker() OVERRIDE;
   virtual VarTracker* GetVarTracker() OVERRIDE;
@@ -80,6 +82,7 @@ class TestGlobals : public PpapiGlobals {
   ResourceTracker resource_tracker_;
   TestVarTracker var_tracker_;
   scoped_refptr<CallbackTracker> callback_tracker_;
+  base::Lock* lock_;
 
   DISALLOW_COPY_AND_ASSIGN(TestGlobals);
 };