Fix IWYU in resource_bundle.cc

BUG=none
TEST=none

Review URL: https://codereview.chromium.org/176343002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253156 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253156
Fix a memory leak in Gtk2UI::GetScrollbarColors().

BUG=346316

Review URL: https://codereview.chromium.org/178133002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253157 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253157