TaskScheduler: Remove base::ExecutionMode.

base/task_scheduler/scheduler_worker.cc

Index: base/task_scheduler/scheduler_worker.cc
diff --git a/base/task_scheduler/scheduler_worker.cc b/base/task_scheduler/scheduler_worker.cc
index 2851a8d43c0948e812bd6d693bded63c43a4d161..5853bf6131e46e67ea8492d1351ef0e53e7338de 100644
--- a/base/task_scheduler/scheduler_worker.cc
+++ b/base/task_scheduler/scheduler_worker.cc
@@ -47,7 +47,8 @@ class SchedulerWorker::Thread : public PlatformThread::Delegate {
     // This is required as SequencedWorkerPool previously blindly CoInitialized
     // all of its threads.
     // TODO: Get rid of this broad COM scope and force tasks that care about a
-    // CoInitialized environment to request one (via an upcoming ExecutionMode).
+    // CoInitialized environment to request one (via an upcoming execution
+    // mode).
     win::ScopedCOMInitializer com_initializer;
 #endif