Delete stale lldb script tools/lldb/lldb_chrome.py

This was originally used to easily inspect string16 in Xcode lldb. It
seems this is not needed anymore since I can see string16 just fine w/o
this script.

Also delete the OWNERS file to let this directory be owned by top level
OWNERS. The OWNERS file was originally created for lldb_chrome.py, which
is no longer needed per above.

Change-Id: I676327e282d6243046df744f6e7de4184537ba98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625970Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: John Wu <jzw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842783}

tools/lldb/OWNERS

-jzw@chromium.org
-ichikawa@chromium.org

tools/lldb/lldb_chrome.py

-# Copyright (c) 2017 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.
-
-"""
-    LLDB Support for Chromium types in Xcode
-
-    Add the following to your ~/.lldbinit:
-    command script import {Path to SRC Root}/tools/lldb/lldb_chrome.py
-"""
-
-import lldb
-
-
-def __lldb_init_module(debugger, internal_dict):
-    debugger.HandleCommand('type summary add -F ' +
-        'lldb_chrome.basestring16_SummaryProvider base::string16')
-
-
-def basestring16_SummaryProvider(valobj, internal_dict):
-    s = valobj.GetValueForExpressionPath('.__r_.__value_.__s')
-    l = valobj.GetValueForExpressionPath('.__r_.__value_.__l')
-    size = s.GetChildMemberWithName('__size_').GetValueAsUnsigned(0)
-    is_short_string = size & 128 == 0  # Assumes _LIBCPP_BIG_ENDIAN is defined.
-    if is_short_string:
-        length = size >> 1
-        data = s.GetChildMemberWithName('__data_').GetPointeeData(0, length)
-    else:
-        length = l.GetChildMemberWithName('__size_').GetValueAsUnsigned(0)
-        data = l.GetChildMemberWithName('__data_').GetPointeeData(0, length)
-    error = lldb.SBError()
-    bytes_to_read = 2 * length
-    if not bytes_to_read:
-        return '""'
-    byte_string = data.ReadRawData(error, 0, bytes_to_read)
-    if error.fail:
-        return 'Summary error: %s' % error.description
-    else:
-        return '"' + byte_string.decode('utf-16') + '"'