Revert of Implement CPU time for OS X and POSIX.

src/base/platform/time.h

Index: src/base/platform/time.h
diff --git a/src/base/platform/time.h b/src/base/platform/time.h
index e17fc1d716dd85e54440f9eeced6ff7f65b3bf1b..834f74a9d9501f5431435312e36dd75bd786d3d7 100644
--- a/src/base/platform/time.h
+++ b/src/base/platform/time.h
@@ -360,7 +360,7 @@
   friend class time_internal::TimeBase<TimeTicks>;
 
   // Please use Now() to create a new object. This is for internal use
-  // and testing. Ticks are in microseconds.
+  // and testing. Ticks is in microseconds.
   explicit TimeTicks(int64_t ticks) : TimeBase(ticks) {}
 };
 
@@ -368,31 +368,6 @@
   return ticks + delta;
 }
 
-
-// ThreadTicks ----------------------------------------------------------------
-
-// Represents a clock, specific to a particular thread, than runs only while the
-// thread is running.
-class ThreadTicks final : public time_internal::TimeBase<ThreadTicks> {
- public:
-  ThreadTicks() : TimeBase(0) {}
-
-  // Returns true if ThreadTicks::Now() is supported on this system.
-  static bool IsSupported();
-
-  // Returns thread-specific CPU-time on systems that support this feature.
-  // Needs to be guarded with a call to IsSupported(). Use this timer
-  // to (approximately) measure how much time the calling thread spent doing
-  // actual work vs. being de-scheduled. May return bogus results if the thread
-  // migrates to another CPU between two calls. Returns an empty ThreadTicks
-  // object until the initialization is completed.
-  static ThreadTicks Now();
-
- private:
-  // This is for internal use and testing. Ticks are in microseconds.
-  explicit ThreadTicks(int64_t ticks) : TimeBase(ticks) {}
-};
-
 }  // namespace base
 }  // namespace v8