Remove allocator_extension_thunks since this layer is not required

base/allocator/allocator.gyp

Index: base/allocator/allocator.gyp
diff --git a/base/allocator/allocator.gyp b/base/allocator/allocator.gyp
index aed162006458075c1cf15e89cf8727e95ea1e76f..d5ec2b64061056e95a90262e292cf1ca3e9b79f1 100644
--- a/base/allocator/allocator.gyp
+++ b/base/allocator/allocator.gyp
@@ -358,19 +358,7 @@
         }],
       ],  # conditions of 'allocator' target.
     },  # 'allocator' target.
-    {
-      'target_name': 'allocator_extension_thunks',
-      'type': 'static_library',
-      'sources': [
-        'allocator_extension_thunks.cc',
-        'allocator_extension_thunks.h',
-      ],
-      'toolsets': ['host', 'target'],
-      'include_dirs': [
-        '../../'
-      ],
-    },
-   ],
+  ],  # targets.
   'conditions': [
     ['OS=="win" and component!="shared_library"', {
       'targets': [
@@ -398,26 +386,5 @@
         },
       ],
     }],
-    ['OS=="win" and target_arch=="ia32"', {
-      'targets': [
-        {
-          'target_name': 'allocator_extension_thunks_win64',
-          'type': 'static_library',
-          'sources': [
-            'allocator_extension_thunks.cc',
-            'allocator_extension_thunks.h',
-          ],
-          'toolsets': ['host', 'target'],
-          'include_dirs': [
-            '../../'
-          ],
-          'configurations': {
-            'Common_Base': {
-              'msvs_target_platform': 'x64',
-            },
-          },
-        },
-      ],
-    }],
   ],
 }