Adds MediaClientAndroid to support embedder/MediaDrmBridge interaction.

chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastBrowserHelper.java

Index: chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastBrowserHelper.java
diff --git a/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastBrowserHelper.java b/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastBrowserHelper.java
index e9bbcc032d00b3737d3eb17f33e268a037f31f3f..2010e03c08533241731ac5f471349e50db9a74ab 100644
--- a/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastBrowserHelper.java
+++ b/chromecast/browser/android/apk/src/org/chromium/chromecast/shell/CastBrowserHelper.java
@@ -19,9 +19,6 @@ import org.chromium.content.app.ContentApplication;
 import org.chromium.content.browser.BrowserStartupController;
 import org.chromium.content.browser.DeviceUtils;
 import org.chromium.content.common.ContentSwitches;
-import org.chromium.media.MediaDrmBridge;
-
-import java.util.UUID;
 
 /**
  * Static, one-time initialization for the browser process.
@@ -31,10 +28,6 @@ public class CastBrowserHelper {
 
     public static final String COMMAND_LINE_ARGS_KEY = "commandLineArgs";
 
-    private static final String PLAYREADY_KEY_SYSTEM_NAME = "com.chromecast.playready";
-    private static final UUID PLAYREADY_UUID =
-            UUID.fromString("9A04F079-9840-4286-AB92-E65BE0885F95");
-
     private static boolean sIsBrowserInitialized = false;
 
     /**
@@ -76,7 +69,6 @@ public class CastBrowserHelper {
             BrowserStartupController.get(context, LibraryProcessType.PROCESS_BROWSER)
                     .startBrowserProcessesSync(false);
             sIsBrowserInitialized = true;
-            MediaDrmBridge.addKeySystemUuidMapping(PLAYREADY_KEY_SYSTEM_NAME, PLAYREADY_UUID);
             return true;
         } catch (ProcessInitException e) {
             Log.e(TAG, "Unable to launch browser process.", e);