Remove two unneeded uses of std::floor in the GTK tab code.
Remove two unneeded uses of std::floor in the GTK tab code.

- <cmath> was not included, breaking some builds
- one floor was used without the std:: prefix

These floor calls should have been redundant, the result was assigned to an
int, which will cause the same truncation anyway.

Pointed out by Hironori Bono and Craig Schlenter.

Review URL: http://codereview.chromium.org/60088


git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@13080 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