Move last of third_party dirs into DEPS entries

third_party/gflags/README.webrtc

Index: third_party/gflags/README.webrtc
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-URL: https://github.com/gflags/gflags
-Version: 2.1.2
-License: New BSD
-License File: LICENSE
-
-Description:
-The gflags package contains a library that implements commandline
-flags processing. As such it's a replacement for getopt(). It has
-increased flexibility, including built-in support for C++ types like
-string, and the ability to define flags in the source file in which
-they're used.
-
-Local Modifications: None
-
-
-How to update platform configuration files:
-The gen/ directory contains pre-generated configuration header files.
-Historically, all operating systems and architectures have generated
-similar configurations except for Windows. This is why there's only
-posix and win directories below gen/.
-When rolling gflags to a newer version, it's a good idea to check if
-new configuration files needs to be generated as well.
-Do this by running cmake in the newly checked out version of
-gflags. Then diff the generated files with the ones below gen/.
-If you notice a diff, update the files with the updated ones.
-If you suspect platform dependend changes other than Windows, you'll
-have to checkout gflags on the other platforms as well and run
-cmake there too.