Photo Picker dialog: Add a test.

ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java

Index: ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java
diff --git a/ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java b/ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java
index 753a559340d994f64956f794b4dcb295ea7ed12a..dfe4a72a2f098d8be6c350175d5c0f770e08ad6f 100644
--- a/ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java
+++ b/ui/android/java/src/org/chromium/ui/base/SelectFileDialog.java
@@ -38,7 +38,6 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-import java.util.Map;
 import java.util.concurrent.TimeUnit;
 
 /**
@@ -319,11 +318,6 @@ public class SelectFileDialog implements WindowAndroid.IntentCallback,
         }
     }
 
-    @Override
-    public Map<String, Long> getFilesForTesting() {
-        return null;
-    }
-
     private class GetCameraIntentTask extends AsyncTask<Void, Void, Uri> {
         private Boolean mDirectToCamera;
         private WindowAndroid mWindow;