Updated #if in IsH264CodecSupported to match H264[En/De]coder::Create.
Updated #if in IsH264CodecSupported to match H264[En/De]coder::Create.

This will hopefully resolve a crash that might occur if it thinks H264 is
supported when in fact it isn't.

BUG=chromium:615513

Review-Url: https://codereview.webrtc.org/2018273002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#12958}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 073eb7ed1e398bedb8aeef1ce1bfd99f6cd0131c

Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,jchavanton/webrtc,jchavanton/webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,jchavanton/webrtc,jchavanton/webrtc,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,jchavanton/webrtc,Alkalyne/webrtctrunk,jchavanton/webrtc,jchavanton/webrtc,Alkalyne/webrtctrunk