Fix Bug 831810, append UTM params for GA
Remove home search field. Bug 958255.

- GA experiment has completed.
Merge pull request #1593 from jpetto/bug-958255-remove-home-search-field

Remove home search field. Bug 958255.
Merge pull request #1592 from kyoshino/bug-831810-mwc-redirect-utm

Fix Bug 831810, append UTM params to the MWC redirect for GA