Prune the list of third_party symlinks

setup_links.py

Index: setup_links.py
diff --git a/setup_links.py b/setup_links.py
index 947bf2a8d653957374d27c733275cd30cee0125f..b3a072a48ec8450b03689ec217f6fbd0cbb26f99 100755
--- a/setup_links.py
+++ b/setup_links.py
@@ -39,38 +39,17 @@ DIRECTORIES = [
   'net',
   'testing',
   'third_party/binutils',
-  'third_party/boringssl',
-  'third_party/colorama',
   'third_party/drmemory',
-  'third_party/expat',
-  'third_party/icu',
   'third_party/instrumented_libraries',
-  'third_party/jsoncpp',
   'third_party/libjpeg',
   'third_party/libjpeg_turbo',
-  'third_party/libsrtp',
-  'third_party/libudev',
-  'third_party/libvpx',
-  'third_party/libyuv',
   'third_party/llvm-build',
   'third_party/lss',
-  'third_party/nss',
-  'third_party/ocmock',
-  'third_party/openmax_dl',
-  'third_party/opus',
-  'third_party/proguard',
-  'third_party/protobuf',
-  'third_party/sqlite',
-  'third_party/syzygy',
-  'third_party/usrsctp',
   'third_party/yasm',
-  'third_party/zlib',
   'tools/clang',
-  'tools/generate_library_loader',
   'tools/gn',
   'tools/gyp',
   'tools/memory',
-  'tools/protoc_wrapper',
   'tools/python',
   'tools/swarming_client',
   'tools/valgrind',
@@ -96,6 +75,7 @@ if 'android' in target_os:
     'third_party/libxml',
     'third_party/mockito',
     'third_party/modp_b64',
+    'third_party/protobuf',
     'third_party/requests',
     'third_party/robolectric',
     'tools/android',