Remove cmumford from IDB watchlist.

TBR=pwnall@chromium.org

Bug: None
Change-Id: Ie9ef58efb532a0f2392959fa3f3b3cd35118f910
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1744523Reviewed-by: Chris Mumford <cmumford@google.com>
Commit-Queue: Chris Mumford <cmumford@google.com>
Cr-Commit-Position: refs/heads/master@{#685333}

WATCHLISTS

@@ -2067,8 +2067,7 @@
                          'loading-reviews+parser@chromium.org'],
     'blink_image_codecs': ['cblume+imagecodecs@chromium.org',
                            'mbarowsky+watch-image-codecs@chromium.org'],
-    'blink_indexed_db': ['cmumford@chromium.org',
-                         'jsbell+idb@chromium.org'],
+    'blink_indexed_db': ['jsbell+idb@chromium.org'],
     'blink_input': ['dtapuska+blinkwatch@chromium.org',
                     'nzolghadr+blinkwatch@chromium.org'],
     'blink_layers': ['blink-layers+watch@chromium.org'],
@@ -2343,8 +2342,7 @@
     'history_ui': ['dbeam+watch-history-ui@chromium.org'],
     'i18n': ['jshin+watch@chromium.org'],
     'incident_reporting': ['grt+watch@chromium.org'],
-    'indexed_db': ['cmumford@chromium.org',
-                   'jsbell+idb@chromium.org'],
+    'indexed_db': ['jsbell+idb@chromium.org'],
     'infra': ['jbudorick+watch@chromium.org'],
     'ink_drop': ['bruthig+ink_drop@chromium.org'],
     'input': ['dtapuska+chromiumwatch@chromium.org',