Remove MemoryCoordinatorClient from chrome/browser/chromeos.

BUG=888904

Change-Id: I82f7cc310b32a18df79dd46756d685aee03f0276
Reviewed-on: https://chromium-review.googlesource.com/c/1272935Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Takashi Sakamoto <tasak@google.com>
Cr-Commit-Position: refs/heads/master@{#599569}

chrome/browser/chromeos/resource_reporter/resource_reporter.cc

@@ -9,7 +9,6 @@
 #include <utility>
 
 #include "base/bind.h"
-#include "base/memory/memory_coordinator_client_registry.h"
 #include "base/memory/memory_pressure_monitor.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/rand_util.h"
@@ -114,7 +113,6 @@ void ResourceReporter::StartMonitoring(
   is_monitoring_ = true;
   memory_pressure_listener_.reset(new base::MemoryPressureListener(
       base::Bind(&ResourceReporter::OnMemoryPressure, base::Unretained(this))));
-  base::MemoryCoordinatorClientRegistry::GetInstance()->Register(this);
 }
 
 void ResourceReporter::StopMonitoring() {
@@ -131,8 +129,6 @@ void ResourceReporter::StopMonitoring() {
 
   is_monitoring_ = false;
   memory_pressure_listener_.reset();
-
-  base::MemoryCoordinatorClientRegistry::GetInstance()->Unregister(this);
 }
 
 void ResourceReporter::OnTasksRefreshedWithBackgroundCalculations(
@@ -434,20 +430,4 @@ void ResourceReporter::StopRecordingCurrentState() {
     observed_task_manager()->RemoveObserver(this);
 }
 
-void ResourceReporter::OnMemoryStateChange(base::MemoryState state) {
-  switch (state) {
-    case base::MemoryState::NORMAL:
-      StopRecordingCurrentState();
-      break;
-    case base::MemoryState::THROTTLED:
-      StartRecordingCurrentState();
-      break;
-    case base::MemoryState::SUSPENDED:
-    // Note: Not supported at present. Fall through.
-    case base::MemoryState::UNKNOWN:
-      NOTREACHED();
-      break;
-  }
-}
-
 }  // namespace chromeos

chrome/browser/chromeos/resource_reporter/resource_reporter.h

@@ -14,7 +14,6 @@
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
-#include "base/memory/memory_coordinator_client.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/memory/singleton.h"
 #include "chrome/browser/task_manager/task_manager_observer.h"
@@ -28,8 +27,7 @@ namespace chromeos {
 // Chrome tasks and reports a weighted random sample of them via Rappor whenever
 // memory pressure is critical. The reporting is limited to once per
 // |kMinimumTimeBetweenReportsInMS|.
-class ResourceReporter : public task_manager::TaskManagerObserver,
-                         public base::MemoryCoordinatorClient {
+class ResourceReporter : public task_manager::TaskManagerObserver {
  public:
   // A collection of the data of a task manager's task that the ResourceReporter
   // is interested in.
@@ -152,9 +150,6 @@ class ResourceReporter : public task_manager::TaskManagerObserver,
   // Gets the bucket in which the current system's number of CPU cores fall.
   static CpuCoresNumberRange GetCurrentSystemCpuCoresRange();
 
-  // base::MemoryCoordinatorClient:
-  void OnMemoryStateChange(base::MemoryState state) override;
-
   // Perform a weighted random sampling to select a task by its CPU or memory
   // usage weights so that we can record samples for them via Rappor.
   // They return nullptr if no TaskRecord has been selected.