MediaSync: fix a typo.

Bug: 19666434
Change-Id: I31e959f49d2539e11a9f23f9f9d7eb785ec08512
diff --git a/media/jni/android_media_MediaSync.cpp b/media/jni/android_media_MediaSync.cpp
index a1f1d7e..b96c733 100644
--- a/media/jni/android_media_MediaSync.cpp
+++ b/media/jni/android_media_MediaSync.cpp
@@ -277,7 +277,7 @@
     CHECK(gFields.mediaTimestampNanoTimeID != NULL);
 
     gFields.mediaTimestampClockRateID =
-        env->GetFieldID(clazz.get(), "ClockRate", "F");
+        env->GetFieldID(clazz.get(), "clockRate", "F");
     CHECK(gFields.mediaTimestampClockRateID != NULL);
 }