Remove retry_decorator from third_party

It's not used.

R=gavinmak@google.com

Fixed: 1256920
Change-Id: Iffae29035839d553faa46149cd6d9eadfc6b2395
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3273328
Auto-Submit: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>

third_party/retry_decorator/LICENSE.google

-Copyright (c) 2013, SaltyCrane
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
- * Redistributions of source code must retain the above copyright
-   notice, this list of conditions and the following disclaimer.
-
- * Redistributions in binary form must reproduce the above copyright
-   notice, this list of conditions and the following disclaimer in the
-   documentation and/or other materials provided with the
-   distribution.
-
- * Neither the name of the SaltyCrane nor the names of its
-   contributors may be used to endorse or promote products derived
-   from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

third_party/retry_decorator/decorators.py

-import time
-from functools import wraps
-
-
-def retry(ExceptionToCheck, tries=4, delay=3, backoff=2, logger=None):
-    """Retry calling the decorated function using an exponential backoff.
-
-    http://www.saltycrane.com/blog/2009/11/trying-out-retry-decorator-python/
-    original from: http://wiki.python.org/moin/PythonDecoratorLibrary#Retry
-
-    :param ExceptionToCheck: the exception to check. may be a tuple of
-        exceptions to check
-    :type ExceptionToCheck: Exception or tuple
-    :param tries: number of times to try (not retry) before giving up
-    :type tries: int
-    :param delay: initial delay between retries in seconds
-    :type delay: int
-    :param backoff: backoff multiplier e.g. value of 2 will double the delay
-        each retry
-    :type backoff: int
-    :param logger: logger to use. If None, print
-    :type logger: logging.Logger instance
-    """
-    def deco_retry(f):
-
-        @wraps(f)
-        def f_retry(*args, **kwargs):
-            mtries, mdelay = tries, delay
-            while mtries > 1:
-                try:
-                    return f(*args, **kwargs)
-                except ExceptionToCheck, e:
-                    msg = "%s, Retrying in %d seconds..." % (str(e), mdelay)
-                    if logger:
-                        logger.warning(msg)
-                    else:
-                        print msg
-                    time.sleep(mdelay)
-                    mtries -= 1
-                    mdelay *= backoff
-            return f(*args, **kwargs)
-
-        return f_retry  # true decorator
-
-    return deco_retry