Update from https://crrev.com/316786

base/memory/discardable_memory_android.cc

 // Copyright (c) 2013 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 "base/memory/discardable_memory.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 26 matching lines @@
                   GetOptimalAshmemRegionSizeForAllocator()) {}
 
   internal::DiscardableMemoryManager manager;
   internal::DiscardableMemoryAshmemAllocator allocator;
 };
 LazyInstance<SharedState>::Leaky g_shared_state = LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 // static
-void DiscardableMemory::ReleaseFreeMemory() {
-  internal::DiscardableMemoryShmem::ReleaseFreeMemory();
-}
-
-// static
 bool DiscardableMemory::ReduceMemoryUsage() {
   return internal::DiscardableMemoryEmulated::ReduceMemoryUsage();
 }
 
 // static
 void DiscardableMemory::GetSupportedTypes(
     std::vector<DiscardableMemoryType>* types) {
   const DiscardableMemoryType supported_types[] = {
     DISCARDABLE_MEMORY_TYPE_ASHMEM,
     DISCARDABLE_MEMORY_TYPE_EMULATED,
@@ skipping 35 matching lines @@
     case DISCARDABLE_MEMORY_TYPE_NONE:
     case DISCARDABLE_MEMORY_TYPE_MACH:
       NOTREACHED();
       return nullptr;
   }
 
   NOTREACHED();
   return nullptr;
 }
 
-// static
-void DiscardableMemory::PurgeForTesting() {
-  g_shared_state.Pointer()->manager.PurgeAll();
-  internal::DiscardableMemoryEmulated::PurgeForTesting();
-  internal::DiscardableMemoryShmem::PurgeForTesting();
-}
-
 }  // namespace base