Revert 64687 - Try to detect internal corruption of histogram instances....

chrome/common/metrics_helpers.cc

Index: chrome/common/metrics_helpers.cc
===================================================================
--- chrome/common/metrics_helpers.cc	(revision 64845)
+++ chrome/common/metrics_helpers.cc	(working copy)
@@ -484,25 +484,9 @@
   // Get up-to-date snapshot of sample stats.
   Histogram::SampleSet snapshot;
   histogram.SnapshotSample(&snapshot);
+
   const std::string& histogram_name = histogram.histogram_name();
 
-  int corruption = histogram.FindCorruption(snapshot);
-  if (corruption) {
-    NOTREACHED();
-    // Don't send corrupt data to metrics survices.
-    UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesBrowser",
-                              corruption, Histogram::NEVER_EXCEEDED_VALUE);
-    typedef std::map<std::string, int> ProblemMap;
-    static ProblemMap* inconsistencies = new ProblemMap;
-    int old_corruption = (*inconsistencies)[histogram_name];
-    if (old_corruption == (corruption | old_corruption))
-      return;  // We've already seen this corruption for this histogram.
-    (*inconsistencies)[histogram_name] |= corruption;
-    UMA_HISTOGRAM_ENUMERATION("Histogram.InconsistenciesBrowserUnique",
-                              corruption, Histogram::NEVER_EXCEEDED_VALUE);
-    return;
-  }
-
   // Find the already sent stats, or create an empty set.
   LoggedSampleMap::iterator it = logged_samples_.find(histogram_name);
   Histogram::SampleSet* already_logged;