base: Remove the string logging from CHECK().

components/sync/engine_impl/sync_scheduler_impl.cc

Index: components/sync/engine_impl/sync_scheduler_impl.cc
diff --git a/components/sync/engine_impl/sync_scheduler_impl.cc b/components/sync/engine_impl/sync_scheduler_impl.cc
index fe52722f06229f13fd092c27807bf8715bc9d0be..8f4b814b617951db8c6c4e72645a5416682aa0f4 100644
--- a/components/sync/engine_impl/sync_scheduler_impl.cc
+++ b/components/sync/engine_impl/sync_scheduler_impl.cc
@@ -293,7 +293,8 @@ void SyncSchedulerImpl::ScheduleConfiguration(
   DCHECK(IsConfigRelatedUpdateSourceValue(params.source));
   DCHECK_EQ(CONFIGURATION_MODE, mode_);
   DCHECK(!params.ready_task.is_null());
-  CHECK(started_) << "Scheduler must be running to configure.";
+  // Scheduler must be running to configure.
+  CHECK(started_);
   SDVLOG(2) << "Reconfiguring syncer.";
 
   // Only one configuration is allowed at a time. Verify we're not waiting
@@ -320,7 +321,8 @@ void SyncSchedulerImpl::ScheduleClearServerData(const ClearParams& params) {
   DCHECK_EQ(CLEAR_SERVER_DATA_MODE, mode_);
   DCHECK(!pending_configure_params_);
   DCHECK(!params.report_success_task.is_null());
-  CHECK(started_) << "Scheduler must be running to clear.";
+  // Scheduler must be running to clear.
+  CHECK(started_);
   pending_clear_params_ = base::MakeUnique<ClearParams>(params);
   TrySyncCycleJob();
 }