GN: Relativize occurrances of //dart

runtime/observatory/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Currently paths here are hard coded for convenience in building Mojo/Flutter.
 declare_args() {
   # Specify the path to a host compatible version of the Dart SDK.
   # This SDK is used to compile the Observatory frontend sources.
   dart_host_sdk = rebase_path("//third_party/dart-sdk/dart-sdk")
 
   # Specify the path to a host compatible version of pub.
   # This is used to compile the Observatory frontend sources.
   dart_host_pub_exe = rebase_path("$dart_host_sdk/bin/pub")
 }
 
 # Helper build rules for packaging the Dart observatory resources.
 observatory_sources_gypi =
     exec_script("../../tools/gypi_to_gn.py",
                 [ rebase_path(
-                    "//dart/runtime/observatory/observatory_sources.gypi") ],
+                    "../observatory/observatory_sources.gypi") ],
                 "scope",
-                [ "//dart/runtime/observatory/observatory_sources.gypi" ])
+                [ "../observatory/observatory_sources.gypi" ])
 
 copy("copy_observatory") {
   sources = rebase_path(observatory_sources_gypi.sources,
                         "",
                         ".")
   outputs = [
     "$root_gen_dir/observatory_copy/{{source_root_relative_dir}}/{{source_file_part}}",
   ]
 }
 
 action("write_observatory_pubspec_yaml") {
   deps = [
     ":copy_observatory",
   ]
 
   script = "../../tools/observatory_tool.py"
 
   inputs = [
     rebase_path("pubspec.yaml"),
   ]
 
   args = [
     "--silent=True",
     "--pub-executable",
     dart_host_pub_exe,
     "--directory",
     rebase_path("$root_gen_dir/observatory_copy/dart/runtime/observatory/"),
     "--command",
     "rewrite",
-    rebase_path("//dart/runtime/observatory/pubspec.yaml"),
+    rebase_path("../observatory/pubspec.yaml"),
     rebase_path(
         "$root_gen_dir/observatory_copy/dart/runtime/observatory/pubspec.yaml"),
     "../../third_party/",
-    rebase_path("../../../dart/third_party/"),
+    rebase_path("../../third_party/"),
   ]
 
   outputs = [
     "$root_gen_dir/observatory_copy/dart/runtime/observatory/pubspec.yaml",
   ]
 }
 
 action("copy_observatory_deps") {
   deps = [
     ":write_observatory_pubspec_yaml",
   ]
 
-  script = "//dart/tools/observatory_tool.py"
+  script = "../../tools/observatory_tool.py"
 
   inputs = [
     script,
     "$root_gen_dir/observatory_copy/dart/runtime/observatory/pubspec.yaml",
   ]
 
   args = [
     "--silent=True",
     "--pub-executable",
     dart_host_pub_exe,
@@ skipping 14 matching lines @@
   sources =
       rebase_path(observatory_sources_gypi.sources,
                   "",
                   "$root_gen_dir/observatory_copy/dart/runtime/observatory")
 
   deps = [
     ":copy_observatory",
     ":copy_observatory_deps",
   ]
 
-  script = "//dart/tools/observatory_tool.py"
+  script = "../../tools/observatory_tool.py"
 
   inputs = [
     script,
     "$root_gen_dir/observatory_copy/dart/runtime/observatory/packages.stamp",
   ]
   inputs += sources
 
   args = [
     "--silent=True",
     "--pub-executable",
     dart_host_pub_exe,
     "--directory",
     rebase_path("$root_gen_dir/observatory_copy/dart/runtime/observatory/"),
     "--command",
     "build",
     rebase_path("$root_out_dir/observatory/build"),
   ]
 
   outputs = [
     "$root_out_dir/observatory/build/web/index.html.polymer.bootstrap.dart.js",
   ]
 }
 
 action("deploy_observatory") {
   deps = [
     ":pub_build_observatory",
   ]
 
-  script = "//dart/tools/observatory_tool.py"
+  script = "../../tools/observatory_tool.py"
 
   inputs = [
     script,
     "$root_out_dir/observatory/build/web/index.html.polymer.bootstrap.dart.js",
   ]
 
   args = [
     "--silent=True",
     "--pub-executable",
     dart_host_pub_exe,
     "--directory",
     rebase_path("$root_out_dir/observatory"),
     "--command",
     "deploy",
   ]
 
   outputs = [
     "$root_out_dir/observatory/deployed/web/index.html.polymer.bootstrap.dart.js",
   ]
 }
 
 action("archive_observatory") {
   deps = [
     ":deploy_observatory",
   ]
 
-  script = "//dart/runtime/tools/create_archive.py"
+  script = "../tools/create_archive.py"
 
   inputs = [
     script,
     "$root_out_dir/observatory/deployed/web/index.html.polymer.bootstrap.dart.js",
   ]
 
   args = [
     "--output",
     rebase_path("$root_gen_dir/observatory/observatory_archive.cc"),
     "--tar_output",
@@ skipping 12 matching lines @@
 
 source_set("embedded_observatory_archive") {
   deps = [
     ":archive_observatory",
   ]
 
   sources = [
     rebase_path("$root_gen_dir/observatory/observatory_archive.cc"),
   ]
 }