Fixing uninitialized member variables in RtpFormatVp8TestHelper

This should fix Coverity DefectId 14374.

BUG=Coverity DefectId 14374
TEST=trybots, rtp_rtcp_unittests

Review URL: https://webrtc-codereview.appspot.com/791004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2735 4adac7df-926f-26a2-2b94-8c16560cd09d

src/modules/rtp_rtcp/source/rtp_format_vp8_test_helper.cc

@@ -23,6 +23,9 @@ RtpFormatVp8TestHelper::RtpFormatVp8TestHelper(const RTPVideoHeaderVP8* hdr)
       data_ptr_(NULL),
       fragmentation_(NULL),
       hdr_info_(hdr),
+      payload_start_(0),
+      payload_size_(0),
+      buffer_size_(0),
       sloppy_partitioning_(false),
       inited_(false) {}