remove generated_sdk from checked in code

tool/build_sdk.sh

Index: tool/build_sdk.sh
diff --git a/tool/build_sdk.sh b/tool/build_sdk.sh
index 80d387acd202187ba8d24c5ca75271ee50bd38a9..9d5078ee981c6ce84edf316725092a1c650da1e5 100755
--- a/tool/build_sdk.sh
+++ b/tool/build_sdk.sh
@@ -4,8 +4,8 @@ set -e
 cd $( dirname "${BASH_SOURCE[0]}" )/..
 
 echo "*** Patching SDK"
-rm -r test/generated_sdk || true
-dart -c tool/patch_sdk.dart tool/input_sdk test/generated_sdk
+rm -r tool/generated_sdk || true
+dart -c tool/patch_sdk.dart tool/input_sdk tool/generated_sdk
 
 echo "*** Compiling SDK to JavaScript"
 if [[ -d lib/runtime/dart ]] ; then
@@ -14,8 +14,8 @@ fi
 
 # TODO(jmesserly): for now we're suppressing errors in SDK compilation
 dart -c bin/devc.dart --no-source-maps --sdk-check --force-compile -l warning \
-    --dart-sdk test/generated_sdk -o lib/runtime/ dart:core \
-    > test/generated_sdk/sdk_errors.txt || true
+    --dart-sdk tool/generated_sdk -o lib/runtime/ dart:core \
+    > tool/generated_sdk/sdk_errors.txt || true
 
 if [[ ! -f lib/runtime/dart/core.js ]] ; then
     echo 'core.js not found, assuming build failed.'
@@ -23,7 +23,7 @@ if [[ ! -f lib/runtime/dart/core.js ]] ; then
     exit 1
 fi
 
-DIFF_ARGS="-u tool/sdk_expected_errors.txt test/generated_sdk/sdk_errors.txt"
+DIFF_ARGS="-u tool/sdk_expected_errors.txt tool/generated_sdk/sdk_errors.txt"
 
 if ! (diff $DIFF_ARGS > /dev/null) ; then
     diff $DIFF_ARGS |\
@@ -31,6 +31,6 @@ if ! (diff $DIFF_ARGS > /dev/null) ; then
         sed -e "s/^\(-.*\)/\1/"
     echo
     echo 'SDK errors have changed.  To update expectations, run:'
-    echo '$ cp test/generated_sdk/sdk_errors.txt tool/sdk_expected_errors.txt'
+    echo '$ cp tool/generated_sdk/sdk_errors.txt tool/sdk_expected_errors.txt'
     exit 1
 fi