Minor cleanups in media/s BUILD.gns and media/capture files

media/capture/content/android/screen_capture_jni_registrar.h

Index: media/capture/content/android/screen_capture_jni_registrar.h
diff --git a/media/capture/content/android/screen_capture_jni_registrar.h b/media/capture/content/android/screen_capture_jni_registrar.h
index a6730b8f2b8bd7d9e0152fbad1e0d3f4f8565dd4..71e4af4c6ecda59e9ad6e3a8e27ef12f2acd7815 100644
--- a/media/capture/content/android/screen_capture_jni_registrar.h
+++ b/media/capture/content/android/screen_capture_jni_registrar.h
@@ -7,12 +7,10 @@
 
 #include <jni.h>
 
-#include "media/base/media_export.h"
-
 namespace media {
 
 // Register all JNI bindings necessary for screen capture.
-MEDIA_EXPORT bool RegisterScreenCaptureJni(JNIEnv* env);
+bool RegisterScreenCaptureJni(JNIEnv* env);
 
 }  // namespace media