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This fixes an MSan error introduced by
https://codereview.chromium.org/2294373002/

==31610==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0xa7ce15a in WriteBytesCommon base/pickle.cc:478:3
    #1 0xa7ce15a in WriteBytesStatic<4> base/pickle.cc:443:0
    #2 0x98c5407 in WritePOD<int> base/pickle.h:367:5
    #3 0x98c5407 in WriteInt base/pickle.h:229:0
    #4 0x98c5407 in Persist net/cert/signed_certificate_timestamp.cc:43:0
    #5 0x991c383 in Persist net/http/http_response_info.cc:381:18
    #6 0x2cb75d0 in TestBody net/http/http_response_info_unittest.cc:111:18

  Uninitialized value was stored to memory at
    #0 0x98c57fd in Persist net/cert/signed_certificate_timestamp.cc:43:3
    #1 0x991c383 in Persist net/http/http_response_info.cc:381:18
    #2 0x2cb75d0 in TestBody net/http/http_response_info_unittest.cc:111:18

  Uninitialized value was created by a heap allocation
    #0 0x8da8c2 in operator new(unsigned long) ??:0
    #1 0xa68c2f8 in GetX509CertSCT net/test/ct_test_util.cc:220:14
    #2 0x2cb7451 in TestBody net/http/http_response_info_unittest.cc:104:3

Review-Url: https://codereview.chromium.org/2337983006
Cr-Commit-Position: refs/heads/master@{#418956}