Fuchsia: Revert observatory inclusion again

runtime/bin/BUILD.gn

 # Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import("gypi_contents.gni")
 
 declare_args() {
   # Whether to fall back to built-in root certificates when they cannot be
   # verified at the operating system level.
   dart_use_fallback_root_certificates = false
@@ skipping 589 matching lines @@
         "iphlpapi.lib",
         "psapi.lib",
         "ws2_32.lib",
         "Rpcrt4.lib",
         "winmm.lib",
       ]
     }
   }
 }
 
-dart_executable("dart") {
-  extra_deps = [
-    "..:libdart",
-    ":dart_snapshot_cc",
-    "../observatory:standalone_observatory_archive",
-  ]
-  extra_sources = [ "builtin_nolib.cc" ]
-}
+if (!defined(is_fuchsia) || !is_fuchsia) {
+  dart_executable("dart") {
+    extra_deps = [
+      "..:libdart",
+      ":dart_snapshot_cc",
+      "../observatory:standalone_observatory_archive",
+    ]
+    extra_sources = [ "builtin_nolib.cc" ]
+  }
 
-dart_executable("dart_noopt") {
-  extra_configs = [ "..:dart_precompiler_config" ]
-  extra_deps = [
-    "..:libdart_noopt",
-    ":dart_snapshot_cc",
-    "../observatory:standalone_observatory_archive",
-  ]
-  extra_sources = [ "builtin_nolib.cc" ]
-}
+  dart_executable("dart_noopt") {
+    extra_configs = [ "..:dart_precompiler_config" ]
+    extra_deps = [
+      "..:libdart_noopt",
+      ":dart_snapshot_cc",
+      "../observatory:standalone_observatory_archive",
+    ]
+    extra_sources = [ "builtin_nolib.cc" ]
+  }
 
-dart_executable("dart_precompiled_runtime") {
-  extra_configs = [ "..:dart_precompiled_runtime_config" ]
-  extra_deps = [
-    "..:libdart_precompiled_runtime",
-    "../observatory:standalone_observatory_archive",
-  ]
-  extra_sources = [
-    "builtin_nolib.cc",
-    "snapshot_empty.cc",
-  ]
+  dart_executable("dart_precompiled_runtime") {
+    extra_configs = [ "..:dart_precompiled_runtime_config" ]
+    extra_deps = [
+      "..:libdart_precompiled_runtime",
+      "../observatory:standalone_observatory_archive",
+    ]
+    extra_sources = [
+      "builtin_nolib.cc",
+      "snapshot_empty.cc",
+    ]
+  }
 }
 
 dart_executable("dart_bootstrap") {
   extra_configs = [
     "..:dart_precompiler_config",
     "..:dart_no_snapshot_config",
   ]
   extra_deps = [
     ":generate_builtin_cc_file",
     ":generate_io_cc_file",
@@ skipping 198 matching lines @@
       # The only effect of DART_SHARED_LIB is to export the Dart API.
       "DART_SHARED_LIB",
     ]
     if (is_win) {
       libs = [ "dart.lib" ]
       abs_root_out_dir = rebase_path(root_out_dir)
       ldflags = [ "/LIBPATH:$abs_root_out_dir" ]
     }
   }
 }