Revert of Suppress findbugs warnings on Chromium for syncronized methods

customtabs/src/android/support/customtabs/CustomTabsClient.java

Index: customtabs/src/android/support/customtabs/CustomTabsClient.java
diff --git a/customtabs/src/android/support/customtabs/CustomTabsClient.java b/customtabs/src/android/support/customtabs/CustomTabsClient.java
index a5047855a5008b98faf621aa45bb62768db7900f..84cf46374ca39798272f7503a1646ff881945e3d 100644
--- a/customtabs/src/android/support/customtabs/CustomTabsClient.java
+++ b/customtabs/src/android/support/customtabs/CustomTabsClient.java
@@ -30,8 +30,6 @@
 import android.support.annotation.Nullable;
 import android.text.TextUtils;
 
-import org.chromium.base.annotations.SuppressFBWarnings;
-
 import java.util.ArrayList;
 import java.util.List;
 
@@ -197,7 +195,6 @@
                 });
             }
 
-            @SuppressFBWarnings("CHROMIUM_SYNCHRONIZED_METHOD")
             @Override
             public synchronized void onMessageChannelReady(final Uri origin, final Bundle extras) {
                 if (callback == null) return;
@@ -209,7 +206,6 @@
                 });
             }
 
-            @SuppressFBWarnings("CHROMIUM_SYNCHRONIZED_METHOD")
             @Override
             public synchronized void onPostMessage(final String message, final Bundle extras) {
                 if (callback == null) return;