[Clean up] Remove code related to install test ca in Telemetry

telemetry/telemetry/internal/platform/platform_backend.py

 # 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.
 
 import weakref
 
 from battor import battor_wrapper
 from telemetry.internal import forwarders
 from telemetry.internal.forwarders import do_nothing_forwarder
 from telemetry.internal.platform import network_controller_backend
@@ skipping 248 matching lines @@
     On systems with multiple CPUs, this function may run on any CPU.
 
     Args:
       msr_number: The number of the register to read.
       start: The least significant bit to read, zero-indexed.
           (Said another way, the number of bits to right-shift the MSR value.)
       length: The number of bits to read. MSRs are 64 bits, even on 32-bit CPUs.
     """
     raise NotImplementedError()
 
-  @property
-  def supports_test_ca(self):
-    """Indicates whether the platform supports installing test CA."""
-    return False
-
-  def InstallTestCa(self):
-    """Install a test CA on the platform."""
-    raise NotImplementedError()
-
-  def RemoveTestCa(self):
-    """Remove a previously installed test CA from the platform."""
-    raise NotImplementedError()
-
   def CanTakeScreenshot(self):
     return False
 
   def TakeScreenshot(self, file_path):
     raise NotImplementedError
 
   def IsCooperativeShutdownSupported(self):
     """Indicates whether CooperativelyShutdown, below, is supported.
     It is not necessary to implement it on all platforms."""
     return False
@@ skipping 23 matching lines @@
     Return:
       Whether the path exists on the target platform.
     """
     raise NotImplementedError()
 
   def HasBattOrConnected(self):
     return battor_wrapper.IsBattOrConnected(self.GetOSName())
 
   def WaitForBatteryTemperature(self, temp):
     pass