Expose a low-end device mode override flags for non-android OSs as well

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/android/sys_utils.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/memory/discardable_memory_allocator_android.h"
 #include "base/memory/discardable_memory_emulated.h"
 #include "base/memory/discardable_memory_malloc.h"
+#include "base/sys_utils.h"
 
 namespace base {
 namespace {
 
 const char kAshmemAllocatorName[] = "DiscardableMemoryAllocator";
 
 struct DiscardableMemoryAllocatorWrapper {
   DiscardableMemoryAllocatorWrapper()
       : allocator(kAshmemAllocatorName,
                   GetOptimalAshmemRegionSizeForAllocator()) {
   }
 
   internal::DiscardableMemoryAllocator allocator;
 
  private:
   // Returns 64 MBytes for a 512 MBytes device, 128 MBytes for 1024 MBytes...
   static size_t GetOptimalAshmemRegionSizeForAllocator() {
     // Note that this may do some I/O (without hitting the disk though) so it
     // should not be called on the critical path.
-    return base::android::SysUtils::AmountOfPhysicalMemoryKB() * 1024 / 8;
+    return base::SysUtils::AmountOfPhysicalMemoryKB() * 1024 / 8;
   }
 };
 
 LazyInstance<DiscardableMemoryAllocatorWrapper>::Leaky g_context =
     LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 // static
 void DiscardableMemory::RegisterMemoryPressureListeners() {
@@ skipping 52 matching lines @@
 bool DiscardableMemory::PurgeForTestingSupported() {
   return false;
 }
 
 // static
 void DiscardableMemory::PurgeForTesting() {
   NOTIMPLEMENTED();
 }
 
 }  // namespace base