Include revId in MobileWebEditing schema

Use 'loggingSchemas/mobileWebEditing' JS module
Which was
  Added in I996d2872a948d870eb6d0cd74b9c2c6e010e52aa
  Removed in Id5070b053ca74c2b05ad149e0bdc4c2931a304dc
  (assuming a bad rebase)

Ensure revId updates on ajax page loads (API change)
Remove user agent field which is now logged by default
Update unit tests

Bug: 61245
Change-Id: I0a34461ea9c758af1d1d1b27fbf4a74b2ced2114
Merge "Include revId in MobileWebEditing schema"