Prune the list of third_party symlinks

BUG=webrtc:5006
R=kjellander@chromium.org, magjed@chromium.org

Review URL: https://codereview.chromium.org/1981883002 .

.gitignore

@@ -22,57 +22,17 @@ pin-log.txt
 /third_party/asan
 /third_party/ashmem
 /third_party/binutils
-/third_party/boringssl
 /third_party/BUILD.gn
-/third_party/clang_format
-/third_party/class-dump
-/third_party/colorama
-/third_party/cygwin
-/third_party/directxsdk
 /third_party/drmemory
-/third_party/expat
-/third_party/gaeunit
 /third_party/gflags/src
-/third_party/icu
 /third_party/instrumented_libraries
-/third_party/ijar
-/third_party/jsoncpp
-/third_party/jsr-305
-/third_party/junit
-/third_party/junit-jar
-/third_party/libc++
-/third_party/libc++abi
-/third_party/libevent
-/third_party/libjingle
 /third_party/libjpeg
 /third_party/libjpeg_turbo
-/third_party/libsrtp
-/third_party/libvpx
-/third_party/libxml
-/third_party/libudev
-/third_party/libyuv
 /third_party/llvm
 /third_party/llvm-build
 /third_party/lss
-/third_party/mockito
-/third_party/modp_b64
-/third_party/nss
-/third_party/oauth2
-/third_party/ocmock
-/third_party/openmax_dl
-/third_party/opus
-/third_party/proguard
 /third_party/protobuf
-/third_party/requests
-/third_party/robolectric
-/third_party/sqlite
-/third_party/syzygy
-/third_party/usrsctp
-/third_party/valgrind
-/third_party/WebKit
-/third_party/winsdk_samples/src
 /third_party/yasm
-/third_party/zlib
 /tools/android
 /tools/clang
 /tools/find_depot_tools.py

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',