(not for review): PlatformThreadHandle: remove public id() interface

base/threading/platform_thread.h

Index: base/threading/platform_thread.h
diff --git a/base/threading/platform_thread.h b/base/threading/platform_thread.h
index 0b922650f0cf405878b6d345bb98f6c2959333c3..786077266aac4b01c65654c2d37a1df4d3923053 100644
--- a/base/threading/platform_thread.h
+++ b/base/threading/platform_thread.h
@@ -73,26 +73,9 @@ class PlatformThreadHandle {
   typedef pthread_t Handle;
 #endif
 
-  PlatformThreadHandle()
-      : handle_(0),
-        id_(0) {
-  }
-
-  explicit PlatformThreadHandle(Handle handle)
-      : handle_(handle),
-        id_(0) {
-  }
+  PlatformThreadHandle() : handle_(0) {}
 
-  PlatformThreadHandle(Handle handle,
-                       PlatformThreadId id)
-      : handle_(handle),
-        id_(id) {
-  }
-
-  // TODO(toyoshim): Remove id() and use PlatformThread::CurrentId() instead.
-  PlatformThreadId id() const {
-    return id_;
-  }
+  explicit PlatformThreadHandle(Handle handle) : handle_(handle) {}
 
   bool is_equal(const PlatformThreadHandle& other) const {
     return handle_ == other.handle_;
@@ -108,7 +91,6 @@ class PlatformThreadHandle {
 
  private:
   Handle handle_;
-  PlatformThreadId id_;
 };
 
 const PlatformThreadId kInvalidThreadId(0);