Set Chrome version/branch to 28.0.1485.1.

Change-Id: I90bf60cbfc690414f4511d68d7b55c0f2a38ad3b
diff --git a/chromeos-base/chromeos-chrome/chromeos-chrome-28.0.1485.1_rc-r1.ebuild b/chromeos-base/chromeos-chrome/chromeos-chrome-28.0.1485.1.ebuild
similarity index 100%
rename from chromeos-base/chromeos-chrome/chromeos-chrome-28.0.1485.1_rc-r1.ebuild
rename to chromeos-base/chromeos-chrome/chromeos-chrome-28.0.1485.1.ebuild