views: change WrenchMenu to use each model's command ID's when creating MenuItemView's

this is in preparation for dynamic recent tabs model and menu:

* WrenchMenu:
- for each menu item, MenuItemView::GetCommand() used to be separate and different from MenuModel::GetCommandIdAt(model_index); they are the same now.
- different range of command id's are reserved for recent tabs and bookmarks.
- command id's of all items in the wrench menu and all its submenus can't clash, except for separator and IDC_SHOW_HISTORY, the latter of which is in both wrench menu and recent tabs submenu.

* RecentTabsSubMenuModel:
- make all command ids within range, use different ids among device name headers.

BUG=256750
TEST=wrench menu and all its submenus still work.

Review URL: https://codereview.chromium.org/25811003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226778 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226778