Report FoundUwSReadError only once per Software Reporter run.

This was introduced by https://codereview.chromium.org/2347753002, during
a code refactoring. The bug is not critical, since we don't look at this
data with much frequency, but we should revert it to the intended behavior.

BUG=676031

Review-Url: https://codereview.chromium.org/2593783002
Cr-Commit-Position: refs/heads/master@{#439889}

chrome/browser/safe_browsing/srt_fetcher_win.cc

@@ -272,12 +272,11 @@ class UMAHistogramReporter {
       } else {
         parse_error = true;
       }
-
-      // Clean up the old value.
-      reporter_key.DeleteValue(kFoundUwsValueName);
-
-      RecordBooleanHistogram(kFoundUwsReadErrorMetricName, parse_error);
     }
+
+    // Clean up the old value.
+    reporter_key.DeleteValue(kFoundUwsValueName);
+    RecordBooleanHistogram(kFoundUwsReadErrorMetricName, parse_error);
   }
 
   // Reports to UMA the memory usage of the software reporter tool as reported