Set up the infrastructure for Extension event metrics.

tools/metrics/histograms/update_extension_functions.py

Index: tools/metrics/histograms/update_extension_functions.py
diff --git a/tools/metrics/histograms/update_extension_functions.py b/tools/metrics/histograms/update_extension_functions.py
deleted file mode 100644
index e06f09e2aa9297517f4a5b5c60c7c97d15569aef..0000000000000000000000000000000000000000
--- a/tools/metrics/histograms/update_extension_functions.py
+++ /dev/null
@@ -1,26 +0,0 @@
-# Copyright 2013 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""Updates ExtensionFunctions enum in histograms.xml file with values read from
-extension_function_histogram_value.h.
-
-If the file was pretty-printed, the updated version is pretty-printed too.
-"""
-
-import os
-import sys
-
-from update_histogram_enum import UpdateHistogramEnum
-
-if __name__ == '__main__':
-  if len(sys.argv) > 1:
-    print >>sys.stderr, 'No arguments expected!'
-    sys.stderr.write(__doc__)
-    sys.exit(1)
-
-  source_header = 'extensions/browser/extension_function_histogram_value.h'
-  UpdateHistogramEnum(histogram_enum_name='ExtensionFunctions',
-                      source_enum_path=source_header,
-                      start_marker='^enum HistogramValue {',
-                      end_marker='^ENUM_BOUNDARY')