sdp: remove extra check for attribute type when parsing fingerprint

for style consistency. This check is already done outside the method.

BUG=None

Change-Id: Ie1366fa57417258a301b02503ad76f304f4279a6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/198040
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Cr-Commit-Position: refs/heads/master@{#32853}

pc/webrtc_sdp.cc

@@ -2273,12 +2273,6 @@ static bool ParseFingerprintAttribute(
     const std::string& line,
     std::unique_ptr<rtc::SSLFingerprint>* fingerprint,
     SdpParseError* error) {
-  if (!IsLineType(line, kLineTypeAttributes) ||
-      !HasAttribute(line, kAttributeFingerprint)) {
-    return ParseFailedExpectLine(line, 0, kLineTypeAttributes,
-                                 kAttributeFingerprint, error);
-  }
-
   std::vector<std::string> fields;
   rtc::split(line.substr(kLinePrefixLength), kSdpDelimiterSpaceChar, &fields);
   const size_t expected_fields = 2;