Fix up TODO: c++0x, update cpplint.

Needed to update cpplint to handle const auto.

Fixed a few cpplint errors that were being missed before.

Replaced most of the TODO c++0x with ranged based loops. Loops which
do not have a descriptive container name have a concrete type instead
of auto.

Change-Id: Id7cc0f27030f56057c544e94277300b3f298c9c5
diff --git a/runtime/base/histogram.h b/runtime/base/histogram.h
index f508af9..2a02cf4 100644
--- a/runtime/base/histogram.h
+++ b/runtime/base/histogram.h
@@ -112,6 +112,6 @@
 
   DISALLOW_COPY_AND_ASSIGN(Histogram);
 };
-}
+}  // namespace art
 
 #endif  // ART_RUNTIME_BASE_HISTOGRAM_H_