Replace "nested message loop" with "nested run loop" in comments.

ppapi/tests/test_case.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_TESTS_TEST_CASE_H_
 #define PPAPI_TESTS_TEST_CASE_H_
 
 #include <stdint.h>
 
 #include <cmath>
@@ skipping 179 matching lines @@
 
    private:
     void Run() {
       int32_t result = loop_.AttachToCurrentThread();
       static_cast<void>(result); // result is not used in the RELEASE build.
       PP_DCHECK(PP_OK == result);
       result_ = (test_case_->*test_to_run_)();
       // Now give the loop a chance to clean up.
       loop_.PostQuit(true /* should_destroy */);
       loop_.Run();
-      // Tell the main thread to quit its nested message loop, now that the test
+      // Tell the main thread to quit its nested run loop, now that the test
       // is complete.
       TestCase::QuitMainMessageLoop(instance_);
     }
 
     std::string result_;
     PP_Instance instance_;
     T* test_case_;
     TestMethodType test_to_run_;
     pp::MessageLoop loop_;
   };
@@ skipping 525 matching lines @@
 #define ASSERT_SUBTEST_SUCCESS(function) \
   do { \
     std::string result = (function); \
     if (!result.empty()) \
       return TestCase::MakeFailureMessage(__FILE__, __LINE__, result.c_str()); \
   } while (false)
 
 #define PASS() return std::string()
 
 #endif  // PPAPI_TESTS_TEST_CASE_H_