Simplify ClassLinker::LoadClass

Starting out by removing the ClassLinker::LoadClass to not take a
DexFile. Then started pulling threads so that ClassLinker::LoadClass
could take a StringPiece instead of const char*. Finally went through
and removed all uses of StringPiece::data() to make sure things are

Change-Id: I47cfa0e8e0e35a31e0ebbd0f7d6a105be83ebe88
11 files changed
tree: a76b400be2463a07265468fe1edb83e2814574b2
  2. build/
  3. src/