OWNERS/WATCHLIST updates for departed team members, per request

Also, adding cmumford@ to modules/indexeddb OWNERS

TBR=alecflett@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/466833002

git-svn-id: svn://svn.chromium.org/blink/trunk@180094 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/modules/filesystem/OWNERS

-ericu@chromium.org
 kinuko@chromium.org
 michaeln@chromium.org
 nhiroki@chromium.org

third_party/WebKit/Source/modules/indexeddb/OWNERS

-alecflett@chromium.org
 dgrogan@chromium.org
 jsbell@chromium.org
+cmumford@chromium.org

third_party/WebKit/WATCHLISTS

@@ -348,7 +348,7 @@
              'mikhail.pozdnyakov@intel.com',
              'aandrey+blink@chromium.org',
              'blink-reviews-wtf@chromium.org' ],
-    'indexed_db': ['alecflett@chromium.org','dgrogan@chromium.org',
+    'indexed_db': ['dgrogan@chromium.org',
                    'jsbell+idb@chromium.org', 'cmumford@chromium.org'],
     'rendering': [ 'pdr@chromium.org',
                    'eae+blinkwatch@chromium.org',
@@ -378,8 +378,7 @@
     'navigator_content_utils': [ 'gyuyoung.kim@webkit.org' ],
     'geolocation': [ 'mvanouwerkerk+watch@chromium.org', 'timvolodine@chromium.org' ],
     'vibration': [ 'mvanouwerkerk+watch@chromium.org' ],
-    'serviceworkers': [ 'alecflett+watch@chromium.org',
-                        'jsbell+serviceworker@chromium.org',
+    'serviceworkers': [ 'jsbell+serviceworker@chromium.org',
                         'kinuko+serviceworker@chromium.org',
                         'tzik@chromium.org',
                         'nhiroki@chromium.org',