Revert git cache diagnostic tracing.

This reverts commit ebba8d75.
This reverts commit fcde3ba0.
This reverts commit fd843fa4.

Bug: 1019824
Change-Id: I14ad2d4f620ac316421f1c3d168b66176af2d26e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1917496
Auto-Submit: John Budorick <jbudorick@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>

git_cache.py

@@ -355,14 +355,6 @@ class Mirror(object):
     if cwd is None:
       cwd = self.mirror_path
 
-    # Print diagnostics and ignore errors.
-    try:
-      self.print('git exe: %s' % (self.git_exe,))
-      self.RunGit(['version'], cwd=cwd)
-      self.RunGit(['config', 'protocol.version'], cwd=cwd)
-    except subprocess.CalledProcessError as e:
-      pass
-
     if reset_fetch_config:
       try:
         self.RunGit(['config', '--unset-all', 'remote.origin.fetch'], cwd=cwd)
@@ -555,34 +547,8 @@ class Mirror(object):
       spec = spec.decode()
       try:
         self.print('Fetching %s' % spec)
-        env = os.environ.copy()
-        env.update({
-            'GIT_TRACE_PACKET': '1',
-            'GIT_TR2_EVENT': '1',
-            'GIT_TRACE2_EVENT': '1',
-            'GIT_TRACE_CURL': '1',
-            'GIT_TRACE_CURL_NO_DATA': '1'
-        })
-        # Only print first 30000 packets. We can use nonlocal keyword once we
-        # switch to python 3.
-        packet_count = [0]
-
-        def FilterPacket(log_line):
-          if 'packet:' in log_line:
-            packet_count[0] += 1
-            if packet_count[0] == 30000:
-              self.print('Truncating remaining packets')
-            if packet_count[0] >= 30000:
-              return
-          self.print(log_line)
-
         with self.print_duration_of('fetch %s' % spec):
-          self.RunGit(
-              fetch_cmd + [spec],
-              cwd=rundir,
-              retry=True,
-              env=env,
-              filter_fn=FilterPacket)
+          self.RunGit(fetch_cmd + [spec], cwd=rundir, retry=True)
       except subprocess.CalledProcessError:
         if spec == '+refs/heads/*:refs/heads/*':
           raise ClobberNeeded()  # Corrupted cache.