gn-build: Get bluetooth.default.so to compile

Now that most of the modules here are compiled in their own static libraries,
there is no need to include their sources from main/BUILD.gn. This CL cleans
this up and adds all the missing dependencies for the //main:bluetooth.default
shared library target. Missing includes and non-Android compile errors have
always been fixed.

BUG=21339022

Change-Id: Ibcc693d5ff17aa9c446db777d4b9fbb706f8c7dd
3 files changed