Revert of High resolution timer fix for Windows

base/pending_task.h

Index: base/pending_task.h
diff --git a/base/pending_task.h b/base/pending_task.h
index a2edc6947d09f9227ebc0b4ada81a7b6cd1c3551..65e17f8d8cb575089325d6359fc08b5e3a5f2147 100644
--- a/base/pending_task.h
+++ b/base/pending_task.h
@@ -18,6 +18,9 @@
 // Contains data about a pending task. Stored in TaskQueue and DelayedTaskQueue
 // for use by classes that queue and execute tasks.
 struct BASE_EXPORT PendingTask : public TrackingInfo {
+#if _MSC_VER >= 1700
+  PendingTask();
+#endif
   PendingTask(const tracked_objects::Location& posted_from,
               const Closure& task);
   PendingTask(const tracked_objects::Location& posted_from,
@@ -40,9 +43,6 @@
 
   // OK to dispatch from a nested loop.
   bool nestable;
-
-  // Needs high resolution timers.
-  bool is_high_res;
 };
 
 // Wrapper around std::queue specialized for PendingTask which adds a Swap