telemetry: Remove 7 obsolete rendering benchmarks.

tools/perf/benchmarks/silk_flags.py

 # Copyright 2014 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.
 
-def CustomizeBrowserOptionsForFastPath(options):
-  """Enables flags needed for bleeding edge rendering fast paths."""
-  options.AppendExtraBrowserArgs('--enable-bleeding-edge-rendering-fast-paths')
-
 def CustomizeBrowserOptionsForSoftwareRasterization(options):
   """Enables flags needed for forced software rasterization."""
   options.AppendExtraBrowserArgs('--disable-gpu-rasterization')
 
 def CustomizeBrowserOptionsForGpuRasterization(options):
   """Enables flags needed for forced GPU rasterization using Ganesh."""
   options.AppendExtraBrowserArgs('--enable-threaded-compositing')
   options.AppendExtraBrowserArgs('--enable-impl-side-painting')
   options.AppendExtraBrowserArgs('--force-gpu-rasterization')
 
 def CustomizeBrowserOptionsForSyncScrolling(options):
   """Enables flags needed for synchronous (main thread) scrolling."""
   options.AppendExtraBrowserArgs('--disable-threaded-scrolling')