predictors: Remove unused histograms for speculative_prefetch_predictor.

tools/metrics/common/presubmit_util.py

 # Copyright 2015 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.
 
 import os
 import sys
 import logging
 import shutil
 
-sys.path.insert(1, os.path.join(sys.path[0], '..', '..', 'python'))
-import google.path_utils
+sys.path.append(
+    os.path.join(os.path.dirname(os.path.abspath(__file__)),
+                 os.pardir, os.pardir, 'python', 'google'))
+import path_utils
 
 import diff_util
 
 def DoPresubmitMain(argv, original_filename, backup_filename, script_name,
                     prettyFn):
   """Execute presubmit/pretty printing for the target file.
 
   Args:
     argv: command line arguments
     original_filename: The filename to read from.
     backup_filename: When pretty printing, move the old file contents here.
     script_name: The name of the script to run for pretty printing.
     prettyFn: A function which takes the original xml content and produces
         pretty printed xml.
 
   Returns:
     An exit status.  Non-zero indicates errors.
   """
   logging.basicConfig(level=logging.INFO)
   presubmit = ('--presubmit' in argv)
 
   # If there is a description xml in the current working directory, use that.
   # Otherwise, use the one residing in the same directory as this script.
   xml_dir = os.getcwd()
   if not os.path.isfile(os.path.join(xml_dir, original_filename)):
-    xml_dir = google.path_utils.ScriptDir()
+    xml_dir = path_utils.ScriptDir()
 
   xml_path = os.path.join(xml_dir, original_filename)
 
   # Save the original file content.
   logging.info('Loading %s...', os.path.relpath(xml_path))
   with open(xml_path, 'rb') as f:
     original_xml = f.read()
 
   # Check there are no CR ('\r') characters in the file.
   if '\r' in original_xml:
@@ skipping 22 matching lines @@
     sys.exit(1)
 
   logging.info('Creating backup file: %s', backup_filename)
   shutil.move(xml_path, os.path.join(xml_dir, backup_filename))
 
   with open(xml_path, 'wb') as f:
     f.write(pretty)
   logging.info('Updated %s. Don\'t forget to add it to your changelist',
                xml_path)
   sys.exit(0)