Fix unit test to allow repeated successful runs by avoiding a function static variable in tests.

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 36753474b5f9efe6acde3e07d3955601d12df264..9fd27132f9127736ac0bc14c99e2828d043eb80b 100644
--- a/ppapi/shared_impl/test_globals.h
+++ b/ppapi/shared_impl/test_globals.h
@@ -42,6 +42,7 @@ class TestGlobals : public PpapiGlobals {
   virtual thunk::ResourceCreationAPI* GetResourceCreationAPI(
       PP_Instance instance) OVERRIDE;
   virtual PP_Module GetModuleForInstance(PP_Instance instance) OVERRIDE;
+  virtual base::MessageLoopProxy* GetMainThreadMessageLoop() OVERRIDE;
   virtual std::string GetCmdLine() OVERRIDE;
   virtual void PreCacheFontForFlash(const void* logfontw) OVERRIDE;
   virtual base::Lock* GetProxyLock() OVERRIDE;
@@ -58,6 +59,7 @@ class TestGlobals : public PpapiGlobals {
   ResourceTracker resource_tracker_;
   TestVarTracker var_tracker_;
   scoped_refptr<CallbackTracker> callback_tracker_;
+  scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(TestGlobals);
 };