Roll Fuchsia SDK to 06ab789730c8f0749bda7eb4fd1e7988eccc38e0

Includes changes to:
- Deprecate the MX_PORT_OPT_V2 option.
- Remove various empty header files previously provided to aid porting
  of Linux code (e.g. sys/syscalls.h).

Bug: 707030
Change-Id: Ibb56470f791036037be69a341ebb716825b16b40
Reviewed-on: https://chromium-review.googlesource.com/572883
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487345}

DEPS

@@ -1205,7 +1205,7 @@ hooks_os = {
       'action': [
         'python',
         'src/build/fuchsia/update_sdk.py',
-        '8b1076a14d3e31dd3e569b44ddb49e49e0799baf',
+        '06ab789730c8f0749bda7eb4fd1e7988eccc38e0',
       ],
     },
   ],

base/message_loop/message_pump_fuchsia.cc

@@ -42,9 +42,7 @@ bool MessagePumpFuchsia::FileDescriptorWatcher::StopWatchingFileDescriptor() {
 
 MessagePumpFuchsia::MessagePumpFuchsia()
     : keep_running_(true), weak_factory_(this) {
-  // TODO(wez): Remove MX_PORT_OPT_V2 once the SDK is rolled, or migrate
-  // this implementation use ulib/port helpers.
-  CHECK_EQ(0, mx_port_create(MX_PORT_OPT_V2, &port_));
+  CHECK_EQ(0, mx_port_create(0, &port_));
 }
 
 MessagePumpFuchsia::~MessagePumpFuchsia() {