Change POST-exclusion to idempotent-inclusion

components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc
index d1e9a4dce6f960cad651a80f67da19efd15a7d57..99b2951abc6120ff1c43e293ea927ad3eaa8ebdd 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc
@@ -7,20 +7,21 @@
 #include <cmath>
 
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_bypass_stats.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_config.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_configurator.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_request_options.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_event_creator.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
+#include "components/data_reduction_proxy/core/common/data_reduction_proxy_util.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/url_util.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_response_headers.h"
 #include "net/proxy/proxy_server.h"
 #include "net/proxy/proxy_service.h"
 
 namespace data_reduction_proxy {
 
 DataReductionProxyDelegate::DataReductionProxyDelegate(
@@ -112,21 +113,21 @@ void OnResolveProxyHandler(const GURL& url,
                            const net::ProxyRetryInfoMap& proxy_retry_info,
                            const DataReductionProxyConfig* config,
                            net::ProxyInfo* result) {
   DCHECK(config);
   DCHECK(result->is_empty() || result->is_direct() ||
          !config->IsDataReductionProxy(result->proxy_server().host_port_pair(),
                                        NULL));
   bool data_saver_proxy_used = true;
   if (result->is_empty() || !result->proxy_server().is_direct() ||
       result->proxy_list().size() != 1 || url.SchemeIsWSOrWSS() ||
-      method == "POST") {
+      !IsMethodIdempotent(method)) {
     return;
   }
 
   if (data_reduction_proxy_config.is_valid()) {
     net::ProxyInfo data_reduction_proxy_info;
     data_reduction_proxy_config.proxy_rules().Apply(url,
                                                     &data_reduction_proxy_info);
     data_reduction_proxy_info.DeprioritizeBadProxies(proxy_retry_info);
     if (!data_reduction_proxy_info.proxy_server().is_direct())
       result->OverrideProxyList(data_reduction_proxy_info.proxy_list());