Replace GetAllErrorCodesForUma calls with UMA_HISTOGRAM_SPARSE_SLOWLY.

net/base/net_errors.cc

Index: net/base/net_errors.cc
diff --git a/net/base/net_errors.cc b/net/base/net_errors.cc
index 425cb9195fa2512fec312b0fe9716e093c9f2be4..ddba87b94c59fbbd39e06aae4a2725bca19126e1 100644
--- a/net/base/net_errors.cc
+++ b/net/base/net_errors.cc
@@ -4,22 +4,6 @@
 
 #include "net/base/net_errors.h"
 
-#include "base/basictypes.h"
-#include "base/metrics/histogram.h"
-#include "base/strings/stringize_macros.h"
-
-namespace {
-
-// Get all valid error codes into an array as positive numbers, for use in the
-// |GetAllErrorCodesForUma| function below.
-#define NET_ERROR(label, value) -(value),
-const int kAllErrorCodes[] = {
-#include "net/base/net_error_list.h"
-};
-#undef NET_ERROR
-
-}  // namespace
-
 namespace net {
 
 const char kErrorDomain[] = "net";
@@ -68,11 +52,6 @@ bool IsClientCertificateError(int error) {
   }
 }
 
-std::vector<int> GetAllErrorCodesForUma() {
-  return base::CustomHistogram::ArrayToCustomRanges(
-      kAllErrorCodes, arraysize(kAllErrorCodes));
-}
-
 Error FileErrorToNetError(base::File::Error file_error) {
   switch (file_error) {
     case base::File::FILE_OK: