PlatformThreadHandle: remove public id() interface

content/browser/power_save_blocker_mac.cc

Index: content/browser/power_save_blocker_mac.cc
diff --git a/content/browser/power_save_blocker_mac.cc b/content/browser/power_save_blocker_mac.cc
index ca466606cf8ea07bb8a3ac7ecbfe619c671e0d54..0ce80f6a2102886ed603031b5f3719d20bf966c8 100644
--- a/content/browser/power_save_blocker_mac.cc
+++ b/content/browser/power_save_blocker_mac.cc
@@ -60,7 +60,7 @@ class PowerSaveBlockerImpl::Delegate
 
 void PowerSaveBlockerImpl::Delegate::ApplyBlock() {
   DCHECK_EQ(base::PlatformThread::CurrentId(),
-            g_power_thread.Pointer()->thread_id());
+            g_power_thread.Pointer()->GetThreadId());
 
   CFStringRef level = NULL;
   // See QA1340 <http://developer.apple.com/library/mac/#qa/qa1340/> for more
@@ -88,7 +88,7 @@ void PowerSaveBlockerImpl::Delegate::ApplyBlock() {
 
 void PowerSaveBlockerImpl::Delegate::RemoveBlock() {
   DCHECK_EQ(base::PlatformThread::CurrentId(),
-            g_power_thread.Pointer()->thread_id());
+            g_power_thread.Pointer()->GetThreadId());
 
   if (assertion_ != kIOPMNullAssertionID) {
     IOReturn result = IOPMAssertionRelease(assertion_);