Move base to DEPS

base/third_party/dynamic_annotations/README.chromium

Index: base/third_party/dynamic_annotations/README.chromium
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-Name: dynamic annotations
-URL: http://code.google.com/p/data-race-test/wiki/DynamicAnnotations
-Version: 4384
-License: BSD
-
-ATTENTION: please avoid using these annotations in Chromium code.
-They were mainly intended to instruct the Valgrind-based version of
-ThreadSanitizer to handle atomic operations. The new version of ThreadSanitizer
-based on compiler instrumentation understands atomic operations out of the box,
-so normally you don't need the annotations.
-If you still think you do, please consider writing a comment at http://crbug.com/349861
-
-One header and one source file (dynamic_annotations.h and dynamic_annotations.c)
-in this directory define runtime macros useful for annotating synchronization
-utilities and benign data races so data race detectors can handle Chromium code
-with better precision.
-
-These files were taken from
-http://code.google.com/p/data-race-test/source/browse/?#svn/trunk/dynamic_annotations
-The files are covered under BSD license as described within the files.