Revert "Adds UMA to measure when the data reduction proxy via header is missing"

components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc

Index: components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
index e2b1d689743b795d92995756ee08fd01df9560b1..de7d98312022f2018263c4d96b1a3d081ba77720 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
@@ -14,7 +14,6 @@
 #include "base/time/time.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_prefs.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_statistics_prefs.h"
-#include "components/data_reduction_proxy/common/data_reduction_proxy_headers_test_utils.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_pref_names.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_switches.h"
 
@@ -32,6 +31,14 @@ const char kProxy[] = "proxy";
 
 namespace data_reduction_proxy {
 
+// Transform "normal"-looking headers (\n-separated) to the appropriate
+// input format for ParseRawHeaders (\0-separated).
+void HeadersToRaw(std::string* headers) {
+  std::replace(headers->begin(), headers->end(), '\n', '\0');
+  if (!headers->empty())
+    *headers += '\0';
+}
+
 ProbeURLFetchResult FetchResult(bool enabled, bool success) {
   if (enabled) {
     if (success)