Replacing sans serif system font with Roboto

Change-Id: Ibe0aa11e2259898e65dc422c7794ab4065a0a90e
diff --git a/libs/rs/rsFont.cpp b/libs/rs/rsFont.cpp
index ce674f4..3917ca1 100644
--- a/libs/rs/rsFont.cpp
+++ b/libs/rs/rsFont.cpp
@@ -735,7 +735,7 @@
     Font *currentFont = mRSC->getFont();
     if (!currentFont) {
         if (!mDefault.get()) {
-            String8 fontsDir("/fonts/DroidSans.ttf");
+            String8 fontsDir("/fonts/Roboto-Regular.ttf");
             String8 fullPath(getenv("ANDROID_ROOT"));
             fullPath += fontsDir;