base: Remove non-caching discardable memory implementation.

base/memory/discardable_memory_android.cc

Index: base/memory/discardable_memory_android.cc
diff --git a/base/memory/discardable_memory_android.cc b/base/memory/discardable_memory_android.cc
index 9e589e2f4003520c1d9afcefbbd3c5e1130c945c..7dd8df71dc736d9e5dd5f3d5f9732d34b6020fea 100644
--- a/base/memory/discardable_memory_android.cc
+++ b/base/memory/discardable_memory_android.cc
@@ -11,7 +11,6 @@
 #include "base/memory/discardable_memory_ashmem.h"
 #include "base/memory/discardable_memory_ashmem_allocator.h"
 #include "base/memory/discardable_memory_emulated.h"
-#include "base/memory/discardable_memory_malloc.h"
 #include "base/sys_info.h"
 
 namespace base {
@@ -53,8 +52,7 @@ void DiscardableMemory::GetSupportedTypes(
     std::vector<DiscardableMemoryType>* types) {
   const DiscardableMemoryType supported_types[] = {
     DISCARDABLE_MEMORY_TYPE_ASHMEM,
-    DISCARDABLE_MEMORY_TYPE_EMULATED,
-    DISCARDABLE_MEMORY_TYPE_MALLOC
+    DISCARDABLE_MEMORY_TYPE_EMULATED
   };
   types->assign(supported_types, supported_types + arraysize(supported_types));
 }
@@ -81,14 +79,6 @@ scoped_ptr<DiscardableMemory> DiscardableMemory::CreateLockedMemoryWithType(
 
       return memory.PassAs<DiscardableMemory>();
     }
-    case DISCARDABLE_MEMORY_TYPE_MALLOC: {
-      scoped_ptr<internal::DiscardableMemoryMalloc> memory(
-          new internal::DiscardableMemoryMalloc(size));
-      if (!memory->Initialize())
-        return scoped_ptr<DiscardableMemory>();
-
-      return memory.PassAs<DiscardableMemory>();
-    }
     case DISCARDABLE_MEMORY_TYPE_NONE:
     case DISCARDABLE_MEMORY_TYPE_MAC:
       NOTREACHED();