Completely remove InterruptableThreadState and Fix ThreadRegistry leak

runtime/vm/thread_interrupter_test.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
 #include "vm/globals.h"
 #include "vm/thread_interrupter.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
 class ThreadInterrupterTestHelper : public AllStatic {
  public:
   static void InterruptTest(const intptr_t run_time, const intptr_t period) {
     const double allowed_error = 0.25;  // +/- 25%
     intptr_t count = 0;
-    ThreadInterrupter::Unregister();
+    Thread::EnsureInit();
+    Thread* thread = Thread::Current();
+    thread->SetThreadInterrupter(IncrementCallback, &count);
     ThreadInterrupter::SetInterruptPeriod(period);
-    ThreadInterrupter::Register(IncrementCallback, &count);
     OS::Sleep(run_time * kMillisecondsPerSecond);
-    ThreadInterrupter::Unregister();
+    thread->SetThreadInterrupter(NULL, NULL);
     intptr_t run_time_micros = run_time * kMicrosecondsPerSecond;
     intptr_t expected_interrupts = run_time_micros / period;
     intptr_t error = allowed_error * expected_interrupts;
     intptr_t low_bar = expected_interrupts - error;
     intptr_t high_bar = expected_interrupts + error;
     EXPECT_GE(count, low_bar);
     EXPECT_LE(count, high_bar);
   }
 
   static void IncrementCallback(const InterruptedThreadState& state,
@@ skipping 21 matching lines @@
 
 TEST_CASE(ThreadInterrupterLow) {
   const intptr_t kRunTimeSeconds = 5;
   const intptr_t kInterruptPeriodMicros = 1000;
   ThreadInterrupterTestHelper::InterruptTest(kRunTimeSeconds,
                                              kInterruptPeriodMicros);
 }
 
 
 }  // namespace dart