Use SuppressFBWarnings to suppress findbugs warnings

android_webview/java/src/org/chromium/android_webview/AwContentsClient.java

Index: android_webview/java/src/org/chromium/android_webview/AwContentsClient.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContentsClient.java b/android_webview/java/src/org/chromium/android_webview/AwContentsClient.java
index b20f521ddc274886a64299ea2d96eb798d53d52d..c327c04dfd56b5e402110df6615795cfc8279dc6 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContentsClient.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContentsClient.java
@@ -18,6 +18,7 @@ import android.webkit.ValueCallback;
 import android.webkit.WebChromeClient;
 
 import org.chromium.android_webview.permission.AwPermissionRequest;
+import org.chromium.base.annotations.SuppressFBWarnings;
 
 import java.security.Principal;
 import java.util.HashMap;
@@ -76,6 +77,7 @@ public abstract class AwContentsClient {
     /**
      * Parameters for the {@link AwContentsClient#showFileChooser} method.
      */
+    @SuppressFBWarnings("URF_UNREAD_PUBLIC_OR_PROTECTED_FIELD")
     public static class FileChooserParams {
         public int mode;
         public String acceptTypes;