[dart][flutter] Update to ComponentContext::Create

CreateFromStartupInfo is being renamed.

DX-387 #comment

Change-Id: Id7a261015ff2395b089b2abdc29524b08aaffdad
diff --git a/runtime/dart_runner/dart_runner.cc b/runtime/dart_runner/dart_runner.cc
index a42b18a..8856fa0 100644
--- a/runtime/dart_runner/dart_runner.cc
+++ b/runtime/dart_runner/dart_runner.cc
@@ -123,7 +123,7 @@
 }  // namespace
 
 DartRunner::DartRunner()
-    : context_(sys::ComponentContext::CreateFromStartupInfo()) {
+    : context_(sys::ComponentContext::Create()) {
   context_->outgoing().AddPublicService<fuchsia::sys::Runner>(
       [this](fidl::InterfaceRequest<fuchsia::sys::Runner> request) {
         bindings_.AddBinding(this, std::move(request));
diff --git a/runtime/flutter_runner/runner.cc b/runtime/flutter_runner/runner.cc
index f4bd0bd..6bb5296 100644
--- a/runtime/flutter_runner/runner.cc
+++ b/runtime/flutter_runner/runner.cc
@@ -96,7 +96,7 @@
 
 Runner::Runner(async::Loop* loop)
     : loop_(loop),
-      host_context_(sys::ComponentContext::CreateFromStartupInfo()) {
+      host_context_(sys::ComponentContext::Create()) {
 #if !defined(DART_PRODUCT)
   // The VM service isolate uses the process-wide namespace. It writes the
   // vm service protocol port under /tmp. The VMServiceObject exposes that