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 6c38acdb7d82ffce114bfb10d40f8a83b9376c2d..e93c123c3e3531b7549d90ba553f83ff1faa06c7 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -1071,8 +1071,6 @@
         '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',
@@ -3141,6 +3139,7 @@
         }],
         ['OS=="android"', {
           'dependencies': [
+            '../components/components.gyp:cdm_browser',
             '../components/components.gyp:web_contents_delegate_android',
             'chrome_browser_jni_headers',
           ],