Track change to private libcore data structure.

Bug: 15476051
Change-Id: I4e28ecfa3a1d03c21f9bbde7f3daf79a79d96fe6
diff --git a/tools/layoutlib/bridge/src/libcore/icu/ICU_Delegate.java b/tools/layoutlib/bridge/src/libcore/icu/ICU_Delegate.java
index 0f66fd7..b3a173f 100644
--- a/tools/layoutlib/bridge/src/libcore/icu/ICU_Delegate.java
+++ b/tools/layoutlib/bridge/src/libcore/icu/ICU_Delegate.java
@@ -228,7 +228,7 @@
         result.decimalSeparator = '.';
         result.groupingSeparator = ',';
         result.patternSeparator = ' ';
-        result.percent = '%';
+        result.percent = "%";
         result.perMill = '\u2030';
         result.monetarySeparator = ' ';
         result.minusSign = "-";