--- a/dom/media/WebMSample.h
+++ b/dom/media/WebMSample.h
@@ -1,9 +1,9 @@
-static uint8_t sWebMSample[] = {
+static const uint8_t sWebMSample[] = {
   0x1a, 0x45, 0xdf, 0xa3, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0x42,
   0x86, 0x81, 0x01, 0x42, 0xf7, 0x81, 0x01, 0x42, 0xf2, 0x81, 0x04, 0x42, 0xf3,
   0x81, 0x08, 0x42, 0x82, 0x84, 0x77, 0x65, 0x62, 0x6d, 0x42, 0x87, 0x81, 0x02,
   0x42, 0x85, 0x81, 0x02, 0x18, 0x53, 0x80, 0x67, 0x01, 0x00, 0x00, 0x00, 0x00,
   0x00, 0x8f, 0x66, 0x11, 0x4d, 0x9b, 0x74, 0x40, 0x2c, 0x4d, 0xbb, 0x8b, 0x53,
   0xab, 0x84, 0x15, 0x49, 0xa9, 0x66, 0x53, 0xac, 0x81, 0xdf, 0x4d, 0xbb, 0x8c,
   0x53, 0xab, 0x84, 0x16, 0x54, 0xae, 0x6b, 0x53, 0xac, 0x82, 0x01, 0x54, 0x4d,
   0xbb, 0x8c, 0x53, 0xab, 0x84, 0x1c, 0x53, 0xbb, 0x6b, 0x53, 0xac, 0x82, 0x8f,