Fix long pressing children in BrowserWebView

 Bug: 5340573
 Caused because showContextMenu happens before the path for actionmode.
 Since none of the children in WebView have a context menu, we can just
 prevent BrowserWebView from ever showing a context menu for a child.

Change-Id: I62644682e5ee43dd3c9e8c155c7403611ae6f355
1 file changed