Update OWNERS and Histogram entries for Budget and BG Fetch

WATCHLISTS

Index: WATCHLISTS
diff --git a/WATCHLISTS b/WATCHLISTS
index 42bd3b2a229dd21cf7a9b24f527fdaced79e7363..1dd2ce97d7582bcd18aa9d65719415eca65c8288 100644
--- a/WATCHLISTS
+++ b/WATCHLISTS
@@ -1657,7 +1657,7 @@
                  'sebsg+autofillwatch@chromium.org',
                  'rogerm+autofillwatch@chromium.org'],
     'background_fetch': ['awdf+watch@chromium.org',
-                         'harkness+watch@chromium.org',
+                         'johnme+watch@chromium.org',
                          'peter@chromium.org'],
     'background_sync': ['chasej+watch@chromium.org',
                         'iclelland+watch@chromium.org',
@@ -2125,8 +2125,7 @@
                      'noyau+watch@chromium.org'],
     'ntp_tiles': ['ntp-dev+reviews@chromium.org',
                   'noyau+watch@chromium.org'],
-    'offline_items_collection': ['harkness+watch@chromium.org',
-                                 'peter@chromium.org'],
+    'offline_items_collection': ['peter@chromium.org'],
     'offline_pages': ['chili+watch@chromium.org',
                       'dewittj+watch@chromium.org',
                       'dimich+watch@chromium.org',
@@ -2174,8 +2173,7 @@
                   'gavinp+prer@chromium.org',
                   'tburkard+watch@chromium.org'],
     'presentation': ['mfoltz+watch@chromium.org'],
-    'push_messaging': ['harkness+watch@chromium.org',
-                       'johnme+watch@chromium.org',
+    'push_messaging': ['johnme+watch@chromium.org',
                        'peter@chromium.org'],
     'reading_list': ['stkhapugin@chromium.org'],
     'remoting': ['chromoting-reviews@chromium.org'],