Componentize EncryptedMediaMessageFilter and rename it CdmMessageFilter.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index ff0289c55bde0fbbce91a059f4dd4b0efade280f..bd0198675cf0825a57cd5dc44f1b35042ed40cad 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -1085,8 +1085,6 @@
         'browser/media/desktop_media_picker.h',
         'browser/media/desktop_streams_registry.cc',
         'browser/media/desktop_streams_registry.h',
-        'browser/media/encrypted_media_message_filter_android.cc',
-        'browser/media/encrypted_media_message_filter_android.h',
         'browser/media/media_capture_devices_dispatcher.cc',
         'browser/media/media_capture_devices_dispatcher.h',
         'browser/media/media_device_id_salt.cc',
@@ -3143,6 +3141,7 @@
         }],
         ['OS=="android"', {
           'dependencies': [
+            '../components/components.gyp:encrypted_media_browser',
             '../components/components.gyp:web_contents_delegate_android',
             'chrome_browser_jni_headers',
           ],