Remove last client of sql::DiagnosticErrorDelegate.

sql/error_delegate_util.h

Index: sql/error_delegate_util.h
diff --git a/sql/error_delegate_util.h b/sql/error_delegate_util.h
index 6b90ccf8b4f16738f24992e002d2c755f55fda35..0c67c07ec7835b83303f9adc306cbe982dc2ed7a 100644
--- a/sql/error_delegate_util.h
+++ b/sql/error_delegate_util.h
@@ -5,8 +5,6 @@
 #ifndef SQL_ERROR_DELEGATE_UTIL_H_
 #define SQL_ERROR_DELEGATE_UTIL_H_
 
-#include "base/metrics/histogram.h"
-#include "sql/connection.h"
 #include "sql/sql_export.h"
 
 namespace sql {
@@ -15,27 +13,6 @@ namespace sql {
 // |error|.
 SQL_EXPORT bool IsErrorCatastrophic(int error);
 
-// Log error in console in debug mode and generate a UMA histogram in release
-// mode for |error| for |UniqueT::name()|.
-// This function is templated because histograms need to be singletons. That is
-// why they are always static at the function scope. The template parameter
-// makes the compiler create unique functions that don't share the same static
-// variable.
-template <class UniqueT>
-void LogAndRecordErrorInHistogram(int error,
-                                  sql::Connection* connection) {
-  LOG(ERROR) << "sqlite error " << error
-             << ", errno " << connection->GetLastErrno()
-             << ": " << connection->GetErrorMessage();
-
-  // Trim off the extended error codes.
-  error &= 0xff;
-
-  // The histogram values from sqlite result codes currently go from 1 to 26
-  // but 50 gives them room to grow.
-  UMA_HISTOGRAM_ENUMERATION(UniqueT::name(), error, 50);
-}
-
 }  // namespace sql
 
 #endif  // SQL_ERROR_DELEGATE_UTIL_H_