msan: build expat from source

DEPS

 use_relative_paths = True
 
 # Dependencies on outside packages.
 #
 deps = {
   "common": "https://skia.googlesource.com/common.git@c282fe0b6e392b14f88d647cbd86e1a3ef5498e0",
 
   # There is some duplication here that might be worth cleaning up:
   #   - can use use our existing t_p/e/libjpeg instead of pulling it for Android?
 
@@ skipping 11 matching lines @@
   "third_party/externals/giflib"  : "https://android.googlesource.com/platform/external/giflib.git@ab10e256df4f684260ca239905b1cec727181f6c",
 
   "third_party/externals/dng_sdk" : "https://android.googlesource.com/platform/external/dng_sdk.git@6579353b8ee5d8aa1f1a96ae22798de9b41e19b8",
   "third_party/externals/piex"    : "https://android.googlesource.com/platform/external/piex.git@a9540117cdd785b0dd75f8c4c28b278f86eb485c",
 
   "third_party/externals/libjpeg-turbo"             : "https://skia.googlesource.com/third_party/libjpeg-turbo.git@36422d9e165a33914436068536772cc6ed1e7886",
   # libjpeg-turbo depends on yasm to compile .asm files
   "third_party/externals/yasm/source/patched-yasm/" : "https://chromium.googlesource.com/chromium/deps/yasm/patched-yasm.git@4671120cd8558ce62ee8672ebf3eb6f5216f909b",
   "third_party/externals/yasm/binaries"             : "https://chromium.googlesource.com/chromium/deps/yasm/binaries.git@52f9b3f4b0aa06da24ef8b123058bb61ee468881",
 
-  "platform_tools/android/third_party/externals/expat" : "https://android.googlesource.com/platform/external/expat.git@android-5.1.0_r3",
+  "third_party/externals/expat" : "https://android.googlesource.com/platform/external/expat.git@android-5.1.0_r3",
 
   "platform_tools/chromeos/toolchain/src/third_party/chromite": "https://chromium.googlesource.com/chromiumos/chromite.git@d6a4c7e0ee4d53ddc5238dbddfc0417796a70e54",
   "platform_tools/chromeos/toolchain/src/third_party/pyelftools": "https://chromium.googlesource.com/chromiumos/third_party/pyelftools.git@bdc1d380acd88d4bfaf47265008091483b0d614e",
 
   # The line below is needed for compiling SkV8Example. Do not delete.
   #"third_party/externals/v8": "https://chromium.googlesource.com/v8/v8.git@5f1ae66d5634e43563b2d25ea652dfb94c31a3b4",
 
   # sfntly is used by the PDF backend for font subsetting
   "third_party/externals/sfntly" : "https://chromium.googlesource.com/external/sfntly/cpp/src.git@1bdaae8fc788a5ac8936d68bf24f37d977a13dac",
   # ICU is needed for sfntly.
   "third_party/externals/icu" : "https://chromium.googlesource.com/chromium/deps/icu.git@ce41627e388fb46ab49671bd16a5db81dcd75a71",
 
   # sdl will be needed for native windows
   "third_party/externals/sdl" : "https://skia.googlesource.com/third_party/sdl@9b526d28cb2d7f0ccff0613c94bb52abc8f53b6f",
 
   # microhttpd for skiaserve
   "third_party/externals/microhttpd" : "https://android.googlesource.com/platform/external/libmicrohttpd@748945ec6f1c67b7efc934ab0808e1d32f2fb98d",
 
   # Mojo SDK for Mojo RPC experiments.
   "third_party/externals/mojo/public" : "https://chromium.googlesource.com/external/github.com/domokit/mojo_sdk@172be18ea745ab29aea132e6cb952e726dc32543",
 }
 
 recursedeps = [ "common" ]