[telemetry] Move stale .pyc check from Python import to gclient hook.

tools/telemetry/telemetry/util/global_hooks.py

Index: tools/telemetry/telemetry/util/global_hooks.py
diff --git a/tools/telemetry/telemetry/util/global_hooks.py b/tools/telemetry/telemetry/util/global_hooks.py
index c7d559922cfdf5d4c9be15f97fc45c4937fa06b6..4ca3aaf801e5da0a6396d2a0a86b2d8fe77a94fb 100644
--- a/tools/telemetry/telemetry/util/global_hooks.py
+++ b/tools/telemetry/telemetry/util/global_hooks.py
@@ -4,49 +4,18 @@
 
 """Hooks that apply globally to all scripts that import or use Telemetry."""
 
-import os
 import signal
 import sys
 
-from telemetry.core import util
 from telemetry.util import exception_formatter
 
 
 def InstallHooks():
-  RemoveAllStalePycFiles(util.GetTelemetryDir())
-  RemoveAllStalePycFiles(util.GetBaseDir())
   InstallUnhandledExceptionFormatter()
   InstallStackDumpOnSigusr1()
   InstallTerminationHook()
 
 
-def RemoveAllStalePycFiles(base_dir):
-  """Scan directories for old .pyc files without a .py file and delete them."""
-  for dirname, _, filenames in os.walk(base_dir):
-    if '.svn' in dirname or '.git' in dirname:
-      continue
-    for filename in filenames:
-      root, ext = os.path.splitext(filename)
-      if ext != '.pyc':
-        continue
-
-      pyc_path = os.path.join(dirname, filename)
-      py_path = os.path.join(dirname, root + '.py')
-
-      try:
-        if not os.path.exists(py_path):
-          os.remove(pyc_path)
-      except OSError:
-        # Wrap OS calls in try/except in case another process touched this file.
-        pass
-
-    try:
-      os.removedirs(dirname)
-    except OSError:
-      # Wrap OS calls in try/except in case another process touched this dir.
-      pass
-
-
 def InstallUnhandledExceptionFormatter():
   """Print prettier exceptions that also contain the stack frame's locals."""
   sys.excepthook = exception_formatter.PrintFormattedException