Revert of Collect data reduction proxy UMA on all platforms

components/data_reduction_proxy/browser/data_reduction_proxy_metrics_unittest.cc

Index: components/data_reduction_proxy/browser/data_reduction_proxy_metrics_unittest.cc
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_metrics_unittest.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_metrics_unittest.cc
index f1139776adbb3ec45f7c89c6a2cad632b9a4ffe4..f5e24f3ed002d455deede08c50ed186a15771bdd 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_metrics_unittest.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_metrics_unittest.cc
@@ -15,6 +15,7 @@
 
 namespace {
 
+#if defined(OS_ANDROID) || defined(OS_IOS)
 const size_t kNumDaysInHistory = 60;
 
 int64 GetListPrefInt64Value(
@@ -26,6 +27,8 @@
   EXPECT_TRUE(base::StringToInt64(string_value, &value));
   return value;
 }
+
+#endif  // defined(OS_ANDROID) || defined(OS_IOS)
 
 }  // namespace
 
@@ -43,6 +46,7 @@
     registry->RegisterInt64Pref(
         data_reduction_proxy::prefs::kHttpOriginalContentLength, 0);
 
+#if defined(OS_ANDROID) || defined(OS_IOS)
     registry->RegisterListPref(data_reduction_proxy::prefs::
                                    kDailyHttpOriginalContentLength);
     registry->RegisterListPref(data_reduction_proxy::prefs::
@@ -74,6 +78,7 @@
     registry->RegisterInt64Pref(
         data_reduction_proxy::prefs::
             kDailyHttpContentLengthLastUpdateDate, 0L);
+#endif  // defined(OS_ANDROID) || defined(OS_IOS)
   }
 
   TestingPrefServiceSimple pref_service_;
@@ -104,6 +109,8 @@
             pref_service_.GetInt64(
                 data_reduction_proxy::prefs::kHttpOriginalContentLength));
 }
+
+#if defined(OS_ANDROID) || defined(OS_IOS)
 
 // The initial last update time used in test. There is no leap second a few
 // days around this time used in the test.
@@ -672,5 +679,6 @@
       original, 1, received, 1,
       original, 1, received, 1);
 }
+#endif  // defined(OS_ANDROID) || defined(OS_IOS)
 
 }  // namespace data_reduction_proxy