Fixed that context menu doesn't disappear by selecting buttons besides webview in...

Fixed that context menu doesn't disappear by selecting buttons besides webview in browser.

[Title] Fixed that context menu doesn't disappear by selecting button besides webview in browser.
        - ex) back, bookmark, more... buttons of browser control bar & reader icon & ...
[Issue#] WEB-1541, WEB-1135, N_SE-7964
[Problem] context menu doesn't disappear by selecting buttons besides webview in browser.
[Cause] There is no routine for hiding context menu in case of this issue.
[Solution] If webview state be change to 'focus-out' state,
           Added routine for hiding context menu and text selection off.

Change-Id: I993b7b6ec9652f2a889ac1e1bb3ce0e345a4601b