Merge MemoryCoordinator and MemoryCoordinatorImpl into one class

content/browser/memory/memory_monitor_android.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/memory/memory_monitor_android.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 56 matching lines @@
 // The maximum level of onTrimMemory (TRIM_MEMORY_COMPLETE).
 const int kTrimMemoryLevelMax = 0x80;
 const int kTrimMemoryRunningLow = 0x10;
 const int kTrimMemoryRunningCritical = 0x15;
 
 // Called by JNI.
 static void OnTrimMemory(JNIEnv* env,
                          const base::android::JavaParamRef<jclass>& jcaller,
                          jint level) {
   DCHECK(level >= 0 && level <= kTrimMemoryLevelMax);
-  auto* coordinator =
-      static_cast<MemoryCoordinatorImpl*>(MemoryCoordinator::GetInstance());
+  auto* coordinator = MemoryCoordinatorImpl::GetInstance();
 
   auto state = coordinator->GetGlobalMemoryState();
   switch (state) {
     case base::MemoryState::NORMAL:
       UMA_HISTOGRAM_ENUMERATION("Memory.Coordinator.TrimMemoryLevel.Normal",
                                 level, kTrimMemoryLevelMax);
       break;
     case base::MemoryState::THROTTLED:
       UMA_HISTOGRAM_ENUMERATION("Memory.Coordinator.TrimMemoryLevel.Throttled",
                                 level, kTrimMemoryLevelMax);
@@ skipping 44 matching lines @@
 void MemoryMonitorAndroid::GetMemoryInfo(MemoryInfo* out) {
   delegate_->GetMemoryInfo(out);
 }
 
 // Implementation of a factory function defined in memory_monitor.h.
 std::unique_ptr<MemoryMonitor> CreateMemoryMonitor() {
   return MemoryMonitorAndroid::Create();
 }
 
 }  // namespace content