Histograms.xml python script housekeeping

tools/metrics/histograms/update_net_error_codes.py

Index: tools/metrics/histograms/update_net_error_codes.py
diff --git a/tools/metrics/histograms/update_net_error_codes.py b/tools/metrics/histograms/update_net_error_codes.py
index 3659dd1afccfc7ad61b70a738ae0ad4359795592..7d40ac23180ce70a76c0fa8d4791f53e2c2d8d49 100755
--- a/tools/metrics/histograms/update_net_error_codes.py
+++ b/tools/metrics/histograms/update_net_error_codes.py
@@ -13,10 +13,10 @@ import os.path
 import re
 import sys
 
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'common'))
-from update_histogram_enum import UpdateHistogramFromDict
+import histograms_path
+import update_histogram_enum
 
-NET_ERROR_LIST_PATH = '../../../net/base/net_error_list.h'
+NET_ERROR_LIST_PATH = 'net/base/net_error_list.h'
 
 POSITIVE_ERROR_REGEX = re.compile(r'^NET_ERROR\(([\w]+), -([0-9]+)\)')
 NEGATIVE_ERROR_REGEX = re.compile(r'^NET_ERROR\(([\w]+), (-[0-9]+)\)')
@@ -26,7 +26,7 @@ def ReadNetErrorCodes(filename, error_regex):
   error code to error name.
   """
   # Read the file as a list of lines
-  with open(filename) as f:
+  with open(histograms_path.GetInputFile(filename)) as f:
     content = f.readlines()
 
   # Parse out lines that are net errors.
@@ -43,12 +43,12 @@ def main():
     sys.stderr.write(__doc__)
     sys.exit(1)
 
-  UpdateHistogramFromDict(
+  update_histogram_enum.UpdateHistogramFromDict(
     'NetErrorCodes',
     ReadNetErrorCodes(NET_ERROR_LIST_PATH, POSITIVE_ERROR_REGEX),
     NET_ERROR_LIST_PATH)
 
-  UpdateHistogramFromDict(
+  update_histogram_enum.UpdateHistogramFromDict(
     'CombinedHttpResponseAndNetErrorCode',
     ReadNetErrorCodes(NET_ERROR_LIST_PATH, NEGATIVE_ERROR_REGEX),
     NET_ERROR_LIST_PATH)