Sync iOS DEPS overrides with downstream

DEPS

Index: DEPS
diff --git a/DEPS b/DEPS
index 0cbea40dcb2096f506cd32b937dd5491a5443639..bf220896aedc6c2df36d2c202c662f0c3df69358 100644
--- a/DEPS
+++ b/DEPS
@@ -385,12 +385,15 @@ deps_os = {
     "src/native_client/src/third_party/ppapi": None,
     "src/third_party/angle": None,
     "src/third_party/bidichecker": None,
+    "src/third_party/brotli/src": None,
     "src/third_party/cld_2/src": None,
     "src/third_party/ffmpeg": None,
     "src/third_party/hunspell_dictionaries": None,
     "src/third_party/hunspell": None,
     "src/third_party/libaddressinput/src/cpp": None,
     "src/third_party/libaddressinput/src/testdata": None,
+    "src/third_party/libc++/trunk": None,
+    "src/third_party/libc++abi/trunk": None,
     "src/third_party/libexif/sources": None,
     "src/third_party/libjpeg_turbo": None,
     "src/third_party/libsrtp": None,
@@ -404,14 +407,16 @@ deps_os = {
     "src/third_party/safe_browsing/testing": None,
     "src/third_party/scons-2.0.1": None,
     "src/third_party/sfntly/cpp/src": None,
+    "src/third_party/speex": None,
     "src/third_party/swig/Lib": None,
-    "src/third_party/undoview": None,
     "src/third_party/usrsctp/usrsctplib": None,
     "src/third_party/v8-i18n": None,
     "src/third_party/webdriver/pylib": None,
     "src/third_party/webgl": None,
     "src/third_party/webpagereplay": None,
     "src/third_party/webrtc": None,
+    "src/third_party/WebKit/LayoutTests/w3c/web-platform-tests": None,
+    "src/third_party/WebKit/LayoutTests/w3c/csswg-test": None,
     "src/third_party/yasm/source/patched-yasm": None,
     "src/tools/page_cycler/acid3": None,
     "src/v8": None,