Remove reference to SystemMonitor on iOS.

Bug was closed as WontFix, so removing the corresponding commented
out code.

Bug: 228014
Change-Id: I9d4e389d319523b40b79b21ac94497ff2c0241d6
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Reviewed-on: https://chromium-review.googlesource.com/893265Reviewed-by: Peter Lee <pkl@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532875}

ios/web/app/web_main_loop.h

@@ -14,7 +14,6 @@
 
 namespace base {
 class PowerMonitor;
-class SystemMonitor;
 }  // namespace base
 
 namespace web {
@@ -72,7 +71,6 @@ class WebMainLoop {
   // The MessageLoop and NetworkChangeNotifier are not owned by the WebMainLoop
   // but still need to be destroyed in correct order so use ScopedClosureRunner.
   base::ScopedClosureRunner destroy_message_loop_;
-  std::unique_ptr<base::SystemMonitor> system_monitor_;
   std::unique_ptr<base::PowerMonitor> power_monitor_;
   base::ScopedClosureRunner destroy_network_change_notifier_;
 

ios/web/app/web_main_loop.mm

@@ -17,7 +17,6 @@
 #include "base/power_monitor/power_monitor.h"
 #include "base/power_monitor/power_monitor_device_source.h"
 #include "base/process/process_metrics.h"
-#include "base/system_monitor/system_monitor.h"
 #include "base/task_scheduler/scheduler_worker_pool_params.h"
 #include "base/task_scheduler/task_scheduler.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ -77,11 +76,8 @@ void WebMainLoop::MainMessageLoopStart() {
 
   InitializeMainThread();
 
-#if 0
-  // TODO(crbug.com/228014): SystemMonitor is not working properly on iOS.
-  system_monitor_.reset(new base::SystemMonitor);
-#endif
-  // TODO(rohitrao): Do we need PowerMonitor on iOS, or can we get rid of it?
+  // TODO(crbug.com/807279): Do we need PowerMonitor on iOS, or can we get rid
+  // of it?
   std::unique_ptr<base::PowerMonitorSource> power_monitor_source(
       new base::PowerMonitorDeviceSource());
   power_monitor_.reset(new base::PowerMonitor(std::move(power_monitor_source)));