Move mojo and mojom from mojo/public/dart to mojo/dart/packages

mojo/dart/packages/mojom/BUILD.gn

Index: mojo/dart/packages/mojom/BUILD.gn
diff --git a/mojo/public/dart/mojom/BUILD.gn b/mojo/dart/packages/mojom/BUILD.gn
similarity index 90%
rename from mojo/public/dart/mojom/BUILD.gn
rename to mojo/dart/packages/mojom/BUILD.gn
index 1a45b22887a7023ea3c332bf3abaff88ac13bd31..d76d78ef00a15b577f3ac300f4c7229f4e37bfdb 100644
--- a/mojo/public/dart/mojom/BUILD.gn
+++ b/mojo/dart/packages/mojom/BUILD.gn
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("../rules.gni")
+import("//mojo/public/dart/rules.gni")
 
 dart_pkg("mojom") {
   libs = [
@@ -23,6 +23,6 @@ dart_pkg("mojom") {
     "pubspec.yaml",
   ]
   deps = [
-    "../third_party",
+    "//mojo/public/dart",
   ]
 }