Add ericu and cmumford as OWNERS of IndexedDB directories

Also, remove some former OWNERS so they don't get tapped for reviews on random patches. But we still love you guys!

NOTRY=true

Review URL: https://codereview.chromium.org/331493002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276469 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/indexed_db/OWNERS

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

content/child/indexed_db/OWNERS

 dgrogan@chromium.org
-hans@chromium.org
 michaeln@chromium.org
 jsbell@chromium.org
-alecflett@chromium.org
+ericu@chromium.org
+cmumford@chromium.org
 
 # For security review of IPC message files.
 per-file *_messages*.h=set noparent

content/common/indexed_db/OWNERS

 dgrogan@chromium.org
-hans@chromium.org
 michaeln@chromium.org
 jsbell@chromium.org
-alecflett@chromium.org
+ericu@chromium.org
+cmumford@chromium.org
 
 # For security review of IPC message files.
 per-file *_messages*.h=set noparent