Roll Fuchsia SDK from 7b819cc87306 to 43e0834be00a

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: I8bd55d5ff4eb7c3078d5d1b8bb075bcfff5a7345
Reviewed-on: https://chromium-review.googlesource.com/1165590Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Fuchsia SDK Autoroller <fuchsia-sdk-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581279}

build/fuchsia/sdk.sha1

-7b819cc87306ccc5c75a7c0dabfa05bc0b2862a6
+43e0834be00a65cd7f811ad3cb5c2528e456ec52
\ No newline at end of file

net/base/network_change_notifier_fuchsia_unittest.cc

@@ -121,13 +121,6 @@ class FakeNetstack : public fuchsia::netstack::Netstack {
   fidl::Binding<fuchsia::netstack::Netstack>& binding() { return binding_; }
 
  private:
-  // fuchsia::netstack::Netstack implementation.
-  void RegisterListener(
-      ::fidl::InterfaceHandle<fuchsia::netstack::NotificationListener> listener)
-      override {
-    NOTREACHED();
-  }
-
   void GetInterfaces(GetInterfacesCallback callback) override {
     callback(std::move(interfaces_));
   }