Remove an #if !defined(OS_LINUX)
Remove an #if !defined(OS_LINUX)

Fixes a linux crash on opening a new tab, because without this code, the render process sends a page_id of 1 to the browser process, which crashes in NavigationController::ClassifyNavigation since page_id==1 is not higher than the max page id (when you've already surfed to another page in a previous tab), so the NavigationController crashes on trying to look up an entry for the page which doesn't exist.

Review URL: http://codereview.chromium.org/60006

git-svn-id: http://src.chromium.org/svn/trunk/src@12954 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 132a74b7aa470e8bd9784e48e060246f6aaafb1d
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser