Remove org.apache.http classes from preloaded classes

Change I686e3c20f5860e58825e1b88f220f9b8c335849c removed the
org.apache.http.legacy library from the bootclasspath which means that
the classes are no longer available to be preloaded by the zygote. This
change removes the classes that cannot be preloaded from the list of
classes to preload.

Bug: 18027885
Test: make droid, flash, check log for "Class not found for preloading"
Change-Id: I57032355d805feb08720c9fcb1076f8e267d73dd