Change POST-exclusion to idempotent-inclusion

components/data_reduction_proxy.gypi

Index: components/data_reduction_proxy.gypi
diff --git a/components/data_reduction_proxy.gypi b/components/data_reduction_proxy.gypi
index f879d3a4be562f1ea999755b809265bf1b90bb90..861a39a0d9c0cc0987d7de552215758fc3a37135 100644
--- a/components/data_reduction_proxy.gypi
+++ b/components/data_reduction_proxy.gypi
@@ -72,20 +72,22 @@
         'data_reduction_proxy/core/common/data_reduction_proxy_event_store.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_event_store.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_headers.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_headers.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_params.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_params.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_pref_names.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_pref_names.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_switches.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_switches.h',
+        'data_reduction_proxy/core/common/data_reduction_proxy_util.cc',
+        'data_reduction_proxy/core/common/data_reduction_proxy_util.h',
         'data_reduction_proxy/core/common/lofi_decider.h',
         'data_reduction_proxy/core/common/lofi_ui_service.h',
      ],
   },
   'conditions': [
     # Small versions of libraries for Cronet.
     ['OS=="android"', {
       'targets' : [
          {
            # GN version: //components/data_reduction_proxy/core/browser:browser_small