[Android] Output unchecked warnings and fix existing instances.

media/base/android/java/src/org/chromium/media/MediaPlayerBridge.java

Index: media/base/android/java/src/org/chromium/media/MediaPlayerBridge.java
diff --git a/media/base/android/java/src/org/chromium/media/MediaPlayerBridge.java b/media/base/android/java/src/org/chromium/media/MediaPlayerBridge.java
index cd3a2b5dc3f788efc07f5aa834e31d39f484488b..1bf800585ae85de7015d52b73ec06a4f44ace56e 100644
--- a/media/base/android/java/src/org/chromium/media/MediaPlayerBridge.java
+++ b/media/base/android/java/src/org/chromium/media/MediaPlayerBridge.java
@@ -9,18 +9,18 @@ import android.media.MediaPlayer;
 import android.net.Uri;
 import android.text.TextUtils;
 
-import java.util.HashMap;
-
 import org.chromium.base.CalledByNative;
 import org.chromium.base.JNINamespace;
 
+import java.util.HashMap;
+
 @JNINamespace("media")
 class MediaPlayerBridge {
     @CalledByNative
     private static boolean setDataSource(MediaPlayer player, Context context, String url,
             String cookies, boolean hideUrlLog) {
         Uri uri = Uri.parse(url);
-        HashMap headersMap = new HashMap<String, String>();
+        HashMap<String, String> headersMap = new HashMap<String, String>();
         if (hideUrlLog)
             headersMap.put("x-hide-urls-from-log", "true");
         if (!TextUtils.isEmpty(cookies))