Removes myself (piotrs@) from and WebAPK patches watchlist.

Need to cut down on noise in my inbox.

Change-Id: Ic958ac4aba2f3ac50180ffa3fdac392f4baf9344
Reviewed-on: https://chromium-review.googlesource.com/684094
Reviewed-by: Kendra Carattini <kcarattini@chromium.org>
Commit-Queue: Piotr Swigon <piotrs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504300}

WATCHLISTS

@@ -1621,8 +1621,7 @@
                     'dtrainor+watch@chromium.org'],
     'android_uma_settings': ['asvitkine+watch@chromium.org',
                              'gayane+watch@chromium.org'],
-    'android_webapk': ['dominickn+watch@chromium.org',
-                       'piotrs+watch@chromium.org'],
+    'android_webapk': ['dominickn+watch@chromium.org'],
     'android_webview': ['android-webview-reviews@chromium.org'],
     'app_list': ['tfarina@chromium.org'],
     'app_shortcuts': ['mgiuca+watch@chromium.org',