Revert of Refactor serving_dirs.

tools/telemetry/telemetry/unittest_util/system_stub.py

Index: tools/telemetry/telemetry/unittest_util/system_stub.py
diff --git a/tools/telemetry/telemetry/unittest_util/system_stub.py b/tools/telemetry/telemetry/unittest_util/system_stub.py
index e0073ca22b9560df6a63c45cd28a04715f67518f..634431e3c545b21823c18246f62f39601d52069f 100644
--- a/tools/telemetry/telemetry/unittest_util/system_stub.py
+++ b/tools/telemetry/telemetry/unittest_util/system_stub.py
@@ -291,17 +291,6 @@
           self, self.INTERNAL_BUCKET, remote_path, local_path, True)
     return result
 
-  def GetFilesInDirectoryIfChanged(self, directory, bucket):
-    if os.path.dirname(directory) == directory: # If in the root dir.
-      raise ValueError('Trying to serve root directory from HTTP server.')
-    for dirpath, _, filenames in os.walk(directory):
-      for filename in filenames:
-        path, extension = os.path.splitext(
-            os.path.join(dirpath, filename))
-        if extension != '.sha1':
-          continue
-        self.GetIfChanged(path, bucket)
-
   def CalculateHash(self, file_path):
     return self.local_file_hashes[file_path]
 
@@ -366,16 +355,12 @@
     def __init__(self, sys_module):
       self.sys = sys_module
       self.files = []
-      self.dirs = []
 
     def exists(self, path):
       return path in self.files
 
     def isfile(self, path):
       return path in self.files
-
-    def isdir(self, path):
-      return path in self.dirs
 
     def join(self, *paths):
       def IsAbsolutePath(path):
@@ -399,10 +384,6 @@
         return tmp.replace('\\', '/')
 
     @staticmethod
-    def abspath(path):
-      return os.path.abspath(path)
-
-    @staticmethod
     def expanduser(path):
       return os.path.expanduser(path)
 
@@ -414,13 +395,8 @@
     def splitext(path):
       return os.path.splitext(path)
 
-    @staticmethod
-    def splitdrive(path):
-      return os.path.splitdrive(path)
-
   X_OK = os.X_OK
 
-  sep = os.sep
   pathsep = os.pathsep
 
   def __init__(self, sys_module=sys):
@@ -432,7 +408,6 @@
     self.program_files = None
     self.program_files_x86 = None
     self.devnull = os.devnull
-    self._directory = {}
 
   def access(self, path, _):
     return path in self.path.files
@@ -455,10 +430,6 @@
   def chdir(self, path):
     pass
 
-  def walk(self, top):
-    for dir_name in self._directory:
-      yield top, dir_name, self._directory[dir_name]
-
 
 class PerfControlModuleStub(object):
   class PerfControlStub(object):