vendorsetup.sh: search for local b2g sdk in prebuilts/ instead of gaia/

Change-Id: Ic594c3a8fe556c977cad34cde8b8a01707e7e695

vendorsetup.sh

@@ -281,14 +281,10 @@ else
    esac
 fi
 
-# Use a local xulrunner SDK if present instead of downloading a new copy
-if [[ -d gaia/xulrunner-sdk/.git ]]; then
+# Use a local B2G SDK if present instead of downloading a new copy
+if [[ -d prebuilts/b2g_sdk/$(uname)/.git ]]; then
    export USE_LOCAL_XULRUNNER_SDK=1
-   export XULRUNNER_DIRECTORY="$(gettop)/gaia/xulrunner-sdk"
-
-elif [[ -d gaia/xulrunner-sdk-$(uname)/.git ]]; then
-   export USE_LOCAL_XULRUNNER_SDK=1
-   export XULRUNNER_DIRECTORY="$(gettop)/gaia/xulrunner-sdk-$(uname)"
+   export XULRUNNER_DIRECTORY="$(gettop)/prebuilts/b2g_sdk/$(uname)"
 fi
 
 # Don't build sources.xml