Update location of intl package. (#12644)

Also switched to relative paths for local packages.

examples/flutter_gallery/BUILD.gn

diff --git a/examples/flutter_gallery/BUILD.gn b/examples/flutter_gallery/BUILD.gn
index 20b4fc8..fdece78 100644
--- a/examples/flutter_gallery/BUILD.gn
+++ b/examples/flutter_gallery/BUILD.gn
@@ -12,7 +12,7 @@
   disable_analysis = true
 
   deps = [
-    "//lib/flutter/packages/flutter",
+    "../../packages/flutter",
     "//third_party/dart-pkg/pub/url_launcher",
   ]
 

packages/flutter/BUILD.gn

diff --git a/packages/flutter/BUILD.gn b/packages/flutter/BUILD.gn
index 1e94aa8..c0d23aa 100644
--- a/packages/flutter/BUILD.gn
+++ b/packages/flutter/BUILD.gn
@@ -10,11 +10,11 @@
   disable_analysis = true
 
   deps = [
+    "//third_party/dart/third_party/pkg/intl",
     "//third_party/dart-pkg/pub/async",
     "//third_party/dart-pkg/pub/collection",
     "//third_party/dart-pkg/pub/http",
     "//third_party/dart-pkg/pub/http_parser",
-    "//third_party/dart-pkg/pub/intl",
     "//third_party/dart-pkg/pub/meta",
     "//third_party/dart-pkg/pub/vector_math",
   ]

packages/flutter_test/BUILD.gn

diff --git a/packages/flutter_test/BUILD.gn b/packages/flutter_test/BUILD.gn
index ebba579..3def0d5 100644
--- a/packages/flutter_test/BUILD.gn
+++ b/packages/flutter_test/BUILD.gn
@@ -10,7 +10,7 @@
   disable_analysis = true
 
   deps = [
-    "//lib/flutter/packages/flutter",
+    "../flutter",
     "//third_party/dart-pkg/pub/quiver",
     "//third_party/dart-pkg/pub/test",
   ]