Use a custom URLRequestContextGetter for performing the secure proxy check.

components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.h
index c7be2e4a30734e5d40814041a1892f43d4bc2209..88dcc11c445c5799d9813b3cf4409ce80496bc97 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.h
@@ -20,6 +20,7 @@
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings_test_utils.h"
 #include "net/base/backoff_entry.h"
 #include "net/log/test_net_log.h"
+#include "net/url_request/url_request_context_getter.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 class TestingPrefServiceSimple;
@@ -32,7 +33,6 @@ namespace net {
 class MockClientSocketFactory;
 class NetLog;
 class URLRequestContext;
-class URLRequestContextGetter;
 class URLRequestContextStorage;
 }
 
@@ -182,6 +182,11 @@ class TestDataReductionProxyIOData : public DataReductionProxyIOData {
     return config_client_.get();
   }
 
+  void SetSimpleURLRequestContextGetter(
+      const scoped_refptr<net::URLRequestContextGetter> context_getter) {
+    basic_url_request_context_getter_ = context_getter;
+  }
+
   base::WeakPtr<DataReductionProxyIOData> GetWeakPtr() {
     return weak_factory_.GetWeakPtr();
   }