A Chrome-side fix for Issue 18232. This change enables the code which displays a context menu when Chrome receives a key event for a menu key or control+F10 keys also on Linux. Even though this change makes Chrome display a context menu when we type control+F10 keys, it cannot make Chrome display a context menu when we type a menu key because WebKit maps a GDK_Menu to a VKEY_MENU. To fix this problem, we need to change WebKit to map a GDK_Menu to a VKEY_APP. 
A Chrome-side fix for Issue 18232.
This change enables the code which displays a context menu when Chrome receives a key event for a menu key or control+F10 keys also on Linux. Even though this change makes Chrome display a context menu when we type control+F10 keys, it cannot make Chrome display a context menu when we type a menu key because WebKit maps a GDK_Menu to a VKEY_MENU. To fix this problem, we need to change WebKit to map a GDK_Menu to a VKEY_APP. 

BUG=18232 "[Linux] Menu key doesn't work"
TEST=Press a menu key (or control+F10 keys), and verify a context menu is displayed.
Review URL: http://codereview.chromium.org/164131

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@22910 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser