base: Remove DiscardableMemoryMach.

base/memory/discardable_memory_unittest.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 <algorithm>
 
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 20 matching lines @@
 
 const size_t kSize = 1024;
 
 TEST_P(DiscardableMemoryTest, IsNamed) {
   std::string type_name(DiscardableMemory::GetTypeName(GetParam()));
   EXPECT_NE("unknown", type_name);
   EXPECT_EQ(GetParam(), DiscardableMemory::GetNamedType(type_name));
 }
 
 bool IsNativeType(DiscardableMemoryType type) {
-  return
 #if defined(OS_ANDROID)
     // SHMEM is backed by native discardable memory on Android.
-    type == DISCARDABLE_MEMORY_TYPE_SHMEM ||
+  return type == DISCARDABLE_MEMORY_TYPE_SHMEM;
+#else
+  return false;
 #endif
-    type == DISCARDABLE_MEMORY_TYPE_MACH;
 }
 
 TEST_P(DiscardableMemoryTest, SupportedNatively) {
   std::vector<DiscardableMemoryType> supported_types;
   DiscardableMemory::GetSupportedTypes(&supported_types);
 #if defined(DISCARDABLE_MEMORY_ALWAYS_SUPPORTED_NATIVELY)
   EXPECT_NE(0, std::count_if(supported_types.begin(),
                              supported_types.end(),
                              IsNativeType));
 #else
@@ skipping 66 matching lines @@
   return supported_types;
 }
 
 INSTANTIATE_TEST_CASE_P(
     DiscardableMemoryTests,
     DiscardableMemoryTest,
     ::testing::ValuesIn(GetSupportedDiscardableMemoryTypes()));
 
 }  // namespace
 }  // namespace base