Revert of Suppress findbugs warnings on Chromium for syncronized methods

customtabs/src/android/support/customtabs/CustomTabsSession.java

Index: customtabs/src/android/support/customtabs/CustomTabsSession.java
diff --git a/customtabs/src/android/support/customtabs/CustomTabsSession.java b/customtabs/src/android/support/customtabs/CustomTabsSession.java
index f0331871b01b91d2022bbd4c89af07dfeb455e5f..8157733298b700d7a0cb65e82d6884b2159460bb 100644
--- a/customtabs/src/android/support/customtabs/CustomTabsSession.java
+++ b/customtabs/src/android/support/customtabs/CustomTabsSession.java
@@ -27,8 +27,6 @@
 import android.support.customtabs.CustomTabsService.Result;
 import android.support.customtabs.CustomTabsSessionToken.DummyCallback;
 import android.widget.RemoteViews;
-
-import org.chromium.base.annotations.SuppressFBWarnings;
 
 import java.util.List;
 
@@ -162,7 +160,6 @@
     }
 
     @Result
-    @SuppressFBWarnings("CHROMIUM_SYNCHRONIZED_METHOD")
     public synchronized int postMessage(String message, Bundle extras) {
         try {
             return mService.postMessage(mCallback, message, extras);