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Use libc++'s implementation of std::unique_ptr instead of our own
internal version. Also get rid of the GCC-only extension of typeof and
replace it with the C++11 equivalent decltype.

Target system binaries do not change size or shrink by a couple bytes
with this switch.

Test: mmma -j32 external/conscrypt; find out/ -name '*.apk' -exec rm {} \;; make -j32; make -j32 build-art-host vogar; vogar --mode host --classpath out/host/common/obj/JAVA_LIBRARIES/core-tests-support-hostdex_intermediates/classes.jack --classpath out/host/common/obj/JAVA_LIBRARIES/core-tests-hostdex_intermediates/classes.jack libcore/luni/src/test/java/libcore/javax/net/ssl/SSLSocketTest.java
Change-Id: I8ffc3c9b3336cc1a8e43b816a07d0832e5344616