Roll Fuchsia SDK from 4f01773b4b54 to b53dcb41c231

The AutoRoll server is located here: https://fuchsia-sdk-chromium-roll.skia.org

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.

CQ_INCLUDE_TRYBOTS=luci.chromium.try:fuchsia_arm64_cast_audio;luci.chromium.try:fuchsia_x64_cast_audio
TBR=cr-fuchsia+bot@chromium.org

Change-Id: I5768d75a7675041750f71cb824c6919c73896d67
Reviewed-on: https://chromium-review.googlesource.com/1180507Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584276}

build/fuchsia/sdk.sha1

-4f01773b4b548b1c26ad1825dd8fa9b791d9318c
+b53dcb41c231e0290aac26395d57b8e30fbd6a0a
\ No newline at end of file

net/base/network_change_notifier_fuchsia_unittest.cc

@@ -165,6 +165,8 @@ class FakeNetstack : public fuchsia::netstack::Netstack {
   void SetFilterStatus(bool enabled,
                        SetFilterStatusCallback callback) override {}
   void GetFilterStatus(GetFilterStatusCallback callback) override {}
+  void SetNameServers(
+      ::fidl::VectorPtr<::fuchsia::netstack::NetAddress> servers) override {}
 
   ::fidl::VectorPtr<fuchsia::netstack::NetInterface> interfaces_ =
       fidl::VectorPtr<fuchsia::netstack::NetInterface>::New(0);