Update references to "webkitpy".

It was moved to third_party/blink/tools, and renamed to "blinkpy".

TBR=timvolodine@chromium.org

Bug: 829697
Change-Id: Ie220adc5ce14025112e360657c3954027ae46ebe
Reviewed-on: https://chromium-review.googlesource.com/1032350
Reviewed-by: Tim Volodine <timvolodine@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#555195}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 0101944bcb57c6a25847a6930585657e93804f97

android/pylib/results/flakiness_dashboard/json_results_generator.py

@@ -4,8 +4,8 @@
 
 #
 # Most of this file was ported over from Blink's
-# Tools/Scripts/webkitpy/layout_tests/layout_package/json_results_generator.py
-# Tools/Scripts/webkitpy/common/net/file_uploader.py
+# tools/blinkpy/web_tests/layout_package/json_results_generator.py
+# tools/blinkpy/common/net/file_uploader.py
 #
 
 import json