Coverity: Initialize member variables.

CID=13721,14709,16392,17192,17585
BUG=none
TEST=none

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Review URL: http://codereview.chromium.org/7206066

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@90086 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/crypto/signature_creator_mac.cc b/crypto/signature_creator_mac.cc
index 544c9fb..c31459f 100644
--- a/crypto/signature_creator_mac.cc
+++ b/crypto/signature_creator_mac.cc
@@ -37,7 +37,7 @@
   return result.release();
 }
 
-SignatureCreator::SignatureCreator() : sig_handle_(0) {
+SignatureCreator::SignatureCreator() : key_(NULL), sig_handle_(0) {
   EnsureCSSMInit();
 }