Remove unused editing related member functions from WebViewClient

This patch removes unused member functions from WebClientView:
 - shouldApplyStyle
 - shouldChangeSelectedRange
 - shouldDeleteRange
 - shouldBeginEditing
 - shouldEndEditing
 - shouldInsertNode
 - shouldInsertText
 - didBeginEditing
 - didEndEditing

Changes in test expectation texts are updated by machinery, find+xargs+sed.

BUG=302013
TEST=n/a; no behavior changes, existing tests cover this patch
R=tkent@chromium.org

Review URL: https://codereview.chromium.org/26237004

git-svn-id: svn://svn.chromium.org/blink/trunk@159279 bbb929c8-8fbe-4397-9dbb-9b2b20218538