Revert of Use DiscardableMemoryManager on Android.

base/base.gyp

Index: base/base.gyp
diff --git a/base/base.gyp b/base/base.gyp
index 06ad10bfb3c002c8cf60ad42641111d3a104120a..f2151b3521e061a2a74dcc62d53ce627658fab8f 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -474,6 +474,7 @@
         'mac/scoped_sending_event_unittest.mm',
         'md5_unittest.cc',
         'memory/aligned_memory_unittest.cc',
+        'memory/discardable_memory_allocator_android_unittest.cc',
         'memory/discardable_memory_manager_unittest.cc',
         'memory/discardable_memory_unittest.cc',
         'memory/linked_ptr_unittest.cc',
@@ -755,11 +756,6 @@
             ['include', '^sys_string_conversions_mac_unittest\\.mm$'],
           ],
         }],
-        ['OS == "android" and _toolset == "target"', {
-          'sources': [
-            'memory/discardable_memory_ashmem_allocator_unittest.cc',
-          ],
-        }],
         ['OS == "android"', {
           'sources/': [
             ['include', '^debug/proc_maps_linux_unittest\\.cc$'],