Change "Save Web Archive" to "Save Page"

 Bug: 3492152
 If WebView fails to save the page as a web archive (which will
 happen if the page is not an (X)HTML document), instead of
 showing a failure toast we fall back to downloading the URL through
 download manager.
 Also changes the string "Save Web Archive" to "Save Page" and moves
 the menu option to be after "Share page".

Change-Id: Ia4219075ae2585df865b58fa75ad24357150824f
4 files changed