Cleanup Mutex and related classes.

src/optimizing-compiler-thread.h

Index: src/optimizing-compiler-thread.h
diff --git a/src/optimizing-compiler-thread.h b/src/optimizing-compiler-thread.h
index aff94eddc22429b0aeadd05f830e515d7e544eb4..b16c40be5e709147c2691700cb7752d4303b64f6 100644
--- a/src/optimizing-compiler-thread.h
+++ b/src/optimizing-compiler-thread.h
@@ -31,6 +31,7 @@
 #include "atomicops.h"
 #include "flags.h"
 #include "platform.h"
+#include "synchronization/mutex.h"
 #include "unbound-queue-inl.h"
 
 namespace v8 {
@@ -46,12 +47,10 @@ class OptimizingCompilerThread : public Thread {
       Thread("OptimizingCompilerThread"),
 #ifdef DEBUG
       thread_id_(0),
-      thread_id_mutex_(OS::CreateMutex()),
 #endif
       isolate_(isolate),
       stop_semaphore_(OS::CreateSemaphore(0)),
       input_queue_semaphore_(OS::CreateSemaphore(0)),
-      install_mutex_(OS::CreateMutex()),
       time_spent_compiling_(0),
       time_spent_total_(0) {
     NoBarrier_Store(&stop_thread_, static_cast<AtomicWord>(CONTINUE));
@@ -83,11 +82,9 @@ class OptimizingCompilerThread : public Thread {
 #endif
 
   ~OptimizingCompilerThread() {
-    delete install_mutex_;
     delete input_queue_semaphore_;
     delete stop_semaphore_;
 #ifdef DEBUG
-    delete thread_id_mutex_;
 #endif
   }
 
@@ -101,7 +98,7 @@ class OptimizingCompilerThread : public Thread {
 
 #ifdef DEBUG
   int thread_id_;
-  Mutex* thread_id_mutex_;
+  Mutex thread_id_mutex_;
 #endif
 
   Isolate* isolate_;
@@ -109,7 +106,7 @@ class OptimizingCompilerThread : public Thread {
   Semaphore* input_queue_semaphore_;
   UnboundQueue<OptimizingCompiler*> input_queue_;
   UnboundQueue<OptimizingCompiler*> output_queue_;
-  Mutex* install_mutex_;
+  Mutex install_mutex_;
   volatile AtomicWord stop_thread_;
   volatile Atomic32 queue_length_;
   int64_t time_spent_compiling_;