Remove codes related deleting Blink or WebKit repository while processing revisions.

If the script is switching between Blink and WebKit during bisect, over a year it's been only blink
for chromium and we don't need these codes.

BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/513253003

Cr-Commit-Position: refs/heads/master@{#292476}

tools/auto_bisect/bisect_utils.py

@@ -285,35 +285,6 @@ def RunGClientAndCreateConfig(opts, custom_deps=None, cwd=None):
   return return_code
 
 
-def IsDepsFileBlink(git_revision=''):
-  """Reads .DEPS.git and returns whether or not we're using blink.
-
-  Args:
-    git_revision: A git hash revision of chromium.
-  Returns:
-    True if blink, false if webkit.
-  """
-  git_cmd = ['cat-file', 'blob', '%s:%s' %(git_revision, FILE_DEPS_GIT)]
-  search_str = 'blink.git'
-  search_key = 'webkit_url'
-  (out_put, ret_val) = RunGit(git_cmd)
-  if ret_val:
-    search_str = 'blink'
-    search_key = 'webkit_trunk'
-    git_cmd = ['cat-file', 'blob', '%s:%s' %(git_revision, FILE_DEPS)]
-    (out_put, ret_val) = RunGit(git_cmd)
-    if ret_val:
-      print 'Error processing DEPS or .DEPS.git'
-      return False
-  locals =  {
-      'Var': lambda _: locals["vars"][_],
-      'From': lambda *args: None
-  }
-
-  exec out_put in  {}, locals
-
-  return search_str in locals['vars'][search_key]
-
 
 def OnAccessError(func, path, _):
   """Error handler for shutil.rmtree.
@@ -408,9 +379,6 @@ def SetupGitDepot(opts, custom_deps):
     if os.path.isfile(os.path.join('src', FILE_DEPS_GIT)):
       cwd = os.getcwd()
       os.chdir('src')
-      if not IsDepsFileBlink():
-        passed_deps_check = RemoveThirdPartyDirectory('Webkit')
-      else:
       passed_deps_check = True
       if passed_deps_check:
         passed_deps_check = RemoveThirdPartyDirectory('libjingle')

tools/bisect-perf-regression.py

@@ -921,9 +921,6 @@ class BisectPerformanceMetrics(object):
     self.warnings = []
     self.builder = builder.Builder.FromOpts(opts)
 
-    # This always starts true since the script grabs latest first.
-    self.was_blink = True
-
     for d in DEPOT_NAMES:
       # The working directory of each depot is just the path to the depot, but
       # since we're already in 'src', we can skip that part.
@@ -1776,29 +1773,6 @@ class BisectPerformanceMetrics(object):
           path_to_file = os.path.join(path, cur_file)
           os.remove(path_to_file)
 
-  def PerformWebkitDirectoryCleanup(self, revision):
-    """Cleans up the Webkit directory before syncing another revision.
-
-    If the script is switching between Blink and WebKit during bisect,
-    its faster to just delete the directory rather than leave it up to git
-    to sync.
-
-    Returns:
-      True if successful.
-    """
-    cwd = os.getcwd()
-    os.chdir(self.src_cwd)
-
-    is_blink = bisect_utils.IsDepsFileBlink(revision)
-
-    os.chdir(cwd)
-
-    if self.was_blink != is_blink:
-      self.was_blink = is_blink
-      # Removes third_party/Webkit directory.
-      return bisect_utils.RemoveThirdPartyDirectory('Webkit')
-    return True
-
   def PerformCrosChrootCleanup(self):
     """Deletes the chroot.
 
@@ -1841,11 +1815,6 @@ class BisectPerformanceMetrics(object):
       # issues syncing when using the git workflow (crbug.com/377951).
       if not bisect_utils.RemoveThirdPartyDirectory('skia'):
         return False
-      if depot == 'chromium':
-        # The fast webkit cleanup doesn't work for android_chrome
-        # The switch from Webkit to Blink that this deals with now happened
-        # quite a long time ago so this is unlikely to be a problem.
-        return self.PerformWebkitDirectoryCleanup(revision)
     elif depot == 'cros':
       return self.PerformCrosChrootCleanup()
     return True