Update the Angular/DI tests to latest from github.

third_party/pkg/di/scripts/env.sh

+#!/bin/sh
+set -e
+
+if [ -n "$DART_SDK" ]; then
+    DARTSDK=$DART_SDK
+else
+    echo "sdk=== $DARTSDK"
+    DART=`which dart|cat` # pipe to cat to ignore the exit code
+    DARTSDK=`which dart | sed -e 's/\/bin\/dart$/\//'`
+    if [ -z "$DARTSDK" ]; then
+        DARTSDK="`pwd`/dart-sdk"
+    fi
+fi
+
+export DART_SDK="$DARTSDK"
+export DART=${DART:-"$DARTSDK/bin/dart"}
+export PUB=${PUB:-"$DARTSDK/bin/pub"}
+export DARTANALYZER=${DARTANALYZER:-"$DARTSDK/bin/dartanalyzer"}
+export DARTDOC=${DARTDOC:-"$DARTSDK/bin/dartdoc"}
+
+
+export DART_FLAGS='--enable_type_checks --enable_asserts'
+export PATH=$PATH:$DARTSDK/bin