Remove dead SimulateSessionsCommitDelayUpdateImpl.

Bug: 
Change-Id: Id0b90f07d3be8355a29063519a95c1f6ca5e710a
Reviewed-on: https://chromium-review.googlesource.com/691152Reviewed-by: Patrick Noland <pnoland@google.com>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505385}

components/sync/engine_impl/cycle/test_util.cc

@@ -4,8 +4,6 @@
 
 #include "components/sync/engine_impl/cycle/test_util.h"
 
-#include <map>
-
 namespace syncer {
 namespace test_util {
 
@@ -113,16 +111,6 @@ void SimulatePollIntervalUpdateImpl(ModelTypeSet requested_types,
   cycle->delegate()->OnReceivedLongPollIntervalUpdate(new_poll);
 }
 
-void SimulateSessionsCommitDelayUpdateImpl(ModelTypeSet requested_types,
-                                           NudgeTracker* nudge_tracker,
-                                           SyncCycle* cycle,
-                                           const base::TimeDelta& new_delay) {
-  SimulateNormalSuccess(requested_types, nudge_tracker, cycle);
-  std::map<ModelType, base::TimeDelta> delay_map;
-  delay_map[SESSIONS] = new_delay;
-  cycle->delegate()->OnReceivedCustomNudgeDelays(delay_map);
-}
-
 void SimulateGuRetryDelayCommandImpl(SyncCycle* cycle, base::TimeDelta delay) {
   cycle->mutable_status_controller()->set_last_download_updates_result(
       SYNCER_OK);

components/sync/engine_impl/cycle/test_util.h

@@ -66,12 +66,6 @@ void SimulatePollIntervalUpdateImpl(ModelTypeSet requested_types,
                                     SyncCycle* cycle,
                                     const base::TimeDelta& new_poll);
 
-// Works with normal cycles.
-void SimulateSessionsCommitDelayUpdateImpl(ModelTypeSet requested_types,
-                                           NudgeTracker* nudge_tracker,
-                                           SyncCycle* cycle,
-                                           const base::TimeDelta& new_delay);
-
 ACTION_P(SimulateThrottled, throttle) {
   SimulateThrottledImpl(arg0, throttle);
 }
@@ -88,10 +82,6 @@ ACTION_P(SimulatePollIntervalUpdate, poll) {
   SimulatePollIntervalUpdateImpl(arg0, arg1, poll);
 }
 
-ACTION_P(SimulateSessionsCommitDelayUpdate, poll) {
-  SimulateSessionsCommitDelayUpdateImpl(arg0, arg1, arg2, poll);
-}
-
 ACTION_P(SimulateGuRetryDelayCommand, delay) {
   SimulateGuRetryDelayCommandImpl(arg0, delay);
 }