Make sure GetAuthenticatedAccountId() returns a canonicalized id.

sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java

Index: sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java
diff --git a/sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java b/sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java
index be7628736db87cb8043c7407f86deca8c0a3dd84..3b792d0e2f3a151fade06c7849f37dccdba6c34d 100644
--- a/sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java
+++ b/sync/android/java/src/org/chromium/sync/signin/AccountManagerHelper.java
@@ -25,8 +25,10 @@ import org.chromium.net.NetworkChangeNotifier;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Locale;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.regex.Pattern;
 
 import javax.annotation.Nullable;
 
@@ -39,6 +41,12 @@ public class AccountManagerHelper {
 
     private static final String TAG = "AccountManagerHelper";
 
+    private static final Pattern AT_SYMBOL = Pattern.compile("@");
+
+    private static final String GMAIL_COM = "gmail.com";
+
+    private static final String GOOGLEMAIL_COM = "googlemail.com";
+
     public static final String GOOGLE_ACCOUNT_TYPE = "com.google";
 
     private static final Object sLock = new Object();
@@ -122,13 +130,27 @@ public class AccountManagerHelper {
         return getGoogleAccounts().length > 0;
     }
 
+    private String canonicalizeName(String name) {
+        String[] parts = AT_SYMBOL.split(name);
+        if (parts.length != 2) return name;
+
+        if (GOOGLEMAIL_COM.equalsIgnoreCase(parts[1])) {
+            parts[1] = GMAIL_COM;
+        }
+        if (GMAIL_COM.equalsIgnoreCase(parts[1])) {
+            parts[0] = parts[0].replace(".", "");
+        }
+        return (parts[0] + "@" + parts[1]).toLowerCase(Locale.US);
+    }
+
     /**
      * Returns the account if it exists, null otherwise.
      */
     public Account getAccountFromName(String accountName) {
-        Account[] accounts = mAccountManager.getAccountsByType(GOOGLE_ACCOUNT_TYPE);
+        String canonicalName = canonicalizeName(accountName);
+        Account[] accounts = getGoogleAccounts();
         for (Account account : accounts) {
-            if (account.name.equals(accountName)) {
+            if (canonicalizeName(account.name).equals(canonicalName)) {
                 return account;
             }
         }