Constrain ShortcutSource to valid values

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInfo.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInfo.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInfo.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInfo.java
index 949ece8ca28bf62dd7d23eed66bed2d6ddd097af..145258971a6b4a56e950c719fa5423b82dc4fa57 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInfo.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappInfo.java
@@ -76,8 +76,12 @@ public class WebappInfo {
     }
 
     protected static int sourceFromIntent(Intent intent) {
-        return IntentUtils.safeGetIntExtra(
+        int source = IntentUtils.safeGetIntExtra(
                 intent, ShortcutHelper.EXTRA_SOURCE, ShortcutSource.UNKNOWN);
+        if (source >= ShortcutSource.COUNT) {
+            source = ShortcutSource.UNKNOWN;
+        }
+        return source;
     }
 
     private static String titleFromIntent(Intent intent) {