Roll Dart for analyzer fixes

Change-Id: I63c639f0c673a4a036a2f1db8b1c2eb9aada13f1
diff --git a/runtimes/dart b/runtimes/dart
index 6455b2a..29ccca4 100644
--- a/runtimes/dart
+++ b/runtimes/dart
@@ -8,7 +8,7 @@
     <project name="external/github.com/dart-lang/sdk"
              path="dart"
              remote="https://chromium.googlesource.com/external/github.com/dart-lang/sdk"
-             revision="842094726528e26892111d1626bbf04d2d62017a"/>
+             revision="4678f993b6bff232ec32050733b2a57b823f2b1f"/>
     <project name="external/github.com/dart-lang/observatory_pub_packages"
              path="dart/third_party/observatory_pub_packages"
              remote="https://chromium.googlesource.com/external/github.com/dart-lang/observatory_pub_packages"
diff --git a/runtimes/dart_third_party_pkg b/runtimes/dart_third_party_pkg
index 54eb73a..b740ed1 100644
--- a/runtimes/dart_third_party_pkg
+++ b/runtimes/dart_third_party_pkg
@@ -205,8 +205,8 @@
 
     <project name="dart/third_party/pkg/protobuf"
              path="dart/third_party/pkg/protobuf"
-             remote="https://chromium.googlesource.com/external/github.com/dart-lang/dart-protobuf.git"
-             revision="0.5.3"/>
+             remote="https://github.com/dart-lang/protobuf.git"
+             revision="0.5.4"/>
 
     <project name="dart/third_party/pkg/pub"
              path="dart/third_party/pkg/pub"
@@ -266,7 +266,7 @@
     <project name="dart/third_party/pkg/source_maps"
              path="dart/third_party/pkg/source_maps"
              remote="https://chromium.googlesource.com/external/github.com/dart-lang/source_maps.git"
-             revision="0.10.3"/>
+             revision="0.10.4"/>
 
     <project name="dart/third_party/pkg/source_span"
              path="dart/third_party/pkg/source_span"
diff --git a/runtimes/dart_third_party_pkg_head b/runtimes/dart_third_party_pkg_head
index 54eb73a..b740ed1 100644
--- a/runtimes/dart_third_party_pkg_head
+++ b/runtimes/dart_third_party_pkg_head
@@ -205,8 +205,8 @@
 
     <project name="dart/third_party/pkg/protobuf"
              path="dart/third_party/pkg/protobuf"
-             remote="https://chromium.googlesource.com/external/github.com/dart-lang/dart-protobuf.git"
-             revision="0.5.3"/>
+             remote="https://github.com/dart-lang/protobuf.git"
+             revision="0.5.4"/>
 
     <project name="dart/third_party/pkg/pub"
              path="dart/third_party/pkg/pub"
@@ -266,7 +266,7 @@
     <project name="dart/third_party/pkg/source_maps"
              path="dart/third_party/pkg/source_maps"
              remote="https://chromium.googlesource.com/external/github.com/dart-lang/source_maps.git"
-             revision="0.10.3"/>
+             revision="0.10.4"/>
 
     <project name="dart/third_party/pkg/source_span"
              path="dart/third_party/pkg/source_span"