Revert of Add WorkerThread based methods for start/stop of worker threads.

content/child/webthread_impl.cc

Index: content/child/webthread_impl.cc
diff --git a/content/child/webthread_impl.cc b/content/child/webthread_impl.cc
index ede0f8ffc6aeb7834c32bf4276baef7f336c0f60..d53d06e061036ba3a2c8fb99c5bcee800471eb24 100644
--- a/content/child/webthread_impl.cc
+++ b/content/child/webthread_impl.cc
@@ -4,8 +4,6 @@
 
 // An implementation of WebThread in terms of base::MessageLoop and
 // base::Thread
-
-#include <math.h>
 
 #include "content/child/webthread_impl.h"
 
@@ -90,30 +88,6 @@
   return thread_->thread_id() == base::PlatformThread::CurrentId();
 }
 
-void WebThreadImpl::setSharedTimerFiredFunction(
-    SharedTimerFunction timerFunction) {
-  shared_timer_function_ = timerFunction;
-}
-
-void WebThreadImpl::setSharedTimerFireInterval(double interval_seconds) {
-  // See BlinkPlatformImpl::setSharedTimerFireInterval for explanation of
-  // why ceil is used in the interval calculation.
-  int64 interval = static_cast<int64>(
-      ceil(interval_seconds * base::Time::kMillisecondsPerSecond)
-      * base::Time::kMicrosecondsPerMillisecond);
-
-  if (interval < 0)
-    interval = 0;
-
-  shared_timer_.Stop();
-  shared_timer_.Start(FROM_HERE, base::TimeDelta::FromMicroseconds(interval),
-                      this, &WebThreadImpl::OnTimeout);
-}
-
-void WebThreadImpl::stopSharedTimer() {
-  shared_timer_.Stop();
-}
-
 WebThreadImpl::~WebThreadImpl() {
   thread_->Stop();
 }