Prevent crash when adding first account.

chrome/android/java/src/org/chromium/chrome/browser/signin/AccountSigninView.java

Index: chrome/android/java/src/org/chromium/chrome/browser/signin/AccountSigninView.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/signin/AccountSigninView.java b/chrome/android/java/src/org/chromium/chrome/browser/signin/AccountSigninView.java
index 66c6468f9d0613fe417ad9757f2228d48b60bf06..b5e9ca3043ab781d8983d7fa4357142ee0a919c2 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/signin/AccountSigninView.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/signin/AccountSigninView.java
@@ -246,7 +246,7 @@ public class AccountSigninView extends FrameLayout implements ProfileDownloader.
         mProfileData.update();
 
         // Determine how the accounts have changed. Each list should only have unique elements.
-        if (oldAccountNames == null) return;
+        if (oldAccountNames == null || oldAccountNames.isEmpty()) return;
 
         if (!mAccountNames.get(accountToSelect).equals(oldAccountNames.get(oldSelectedAccount))) {
             // Any dialogs that may have been showing are now invalid (they were created for the