Remove the task tracking stuff in the bindings.

mojo/public/cpp/environment/lib/environment.cc

Index: mojo/public/cpp/environment/lib/environment.cc
diff --git a/mojo/public/cpp/environment/lib/environment.cc b/mojo/public/cpp/environment/lib/environment.cc
index 8c7c930671d825cd7624899f72880548d72d4ae0..6fb7e22a2204ef57185897050d743391b5a1684a 100644
--- a/mojo/public/cpp/environment/lib/environment.cc
+++ b/mojo/public/cpp/environment/lib/environment.cc
@@ -9,7 +9,6 @@
 #include "mojo/public/c/environment/logger.h"
 #include "mojo/public/cpp/environment/lib/default_async_waiter.h"
 #include "mojo/public/cpp/environment/lib/default_logger.h"
-#include "mojo/public/cpp/environment/lib/default_task_tracker.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 
 namespace mojo {
@@ -18,34 +17,27 @@ namespace {
 
 const MojoAsyncWaiter* g_default_async_waiter = nullptr;
 const MojoLogger* g_default_logger = nullptr;
-const TaskTracker* g_default_task_tracker = nullptr;
 
 void Init(const MojoAsyncWaiter* default_async_waiter,
-          const MojoLogger* default_logger,
-          const TaskTracker* default_task_tracker) {
+          const MojoLogger* default_logger) {
   g_default_async_waiter = default_async_waiter
                                ? default_async_waiter
                                : &internal::kDefaultAsyncWaiter;
   g_default_logger =
       default_logger ? default_logger : &internal::kDefaultLogger;
 
-  g_default_task_tracker = default_task_tracker
-                               ? default_task_tracker
-                               : &internal::kDefaultTaskTracker;
-
   RunLoop::SetUp();
 }
 
 }  // namespace
 
 Environment::Environment() {
-  Init(nullptr, nullptr, nullptr);
+  Init(nullptr, nullptr);
 }
 
 Environment::Environment(const MojoAsyncWaiter* default_async_waiter,
-                         const MojoLogger* default_logger,
-                         const TaskTracker* default_task_tracker) {
-  Init(default_async_waiter, default_logger, default_task_tracker);
+                         const MojoLogger* default_logger) {
+  Init(default_async_waiter, default_logger);
 }
 
 Environment::~Environment() {
@@ -70,11 +62,6 @@ const MojoLogger* Environment::GetDefaultLogger() {
 }
 
 // static
-const TaskTracker* Environment::GetDefaultTaskTracker() {
-  return g_default_task_tracker;
-}
-
-// static
 void Environment::InstantiateDefaultRunLoop() {
   assert(!RunLoop::current());
   // Not leaked: accessible from |RunLoop::current()|.