Update MIMEtype for MP4 content

Looking at the encrypted MP4 file used in these tests, the profile data is:
- AVCProfileIndication: 100 [Profile = 0x64]
- profile_compatibility: 0  [Flags = 0x00]
- AVCLevelIndication: 30    [Level = 0x1e]
As a result the codecs value should be "avc1.64001E", so updating the
test to use the correct value.

BUG=
TEST=EME browser_tests still pass

Change-Id: Ifeb4c51f2121ca90ee2a0776a030423d5a7b2c0b
Reviewed-on: https://chromium-review.googlesource.com/644506
Reviewed-by: Dan Sanders <[email protected]>
Commit-Queue: John Rummell <[email protected]>
Cr-Commit-Position: refs/heads/master@{#498999}
1 file changed