Added suppression for leak in NSS SSLServerSocket handshake.

tools/valgrind/memcheck/suppressions.txt

 # There are four kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 3608 matching lines @@
    bug_484882
    Memcheck:Uninitialized
    fun:_ZNK8SkStroke10strokePathERK6SkPathPS0_
    fun:_ZNK11SkStrokeRec11applyToPathEP6SkPathRKS0_
    fun:_ZNK7SkPaint11getFillPathERK6SkPathPS0_PK6SkRectf
    fun:_ZNK7SkPaint11getFillPathERK6SkPathPS0_
    fun:_ZNK5blink4Path18strokeBoundingRectERKNS_10StrokeDataE
    fun:_ZNK5blink14LayoutSVGShape26calculateStrokeBoundingBoxEv
    fun:_ZN5blink14LayoutSVGShape22updateShapeFromElementEv
 }
+{
+  bug_487706
+  Memcheck:Leak
+  fun:calloc
+  ...
+  fun:ssl3_HandleClientHello
+  fun:ssl3_HandleHandshakeMessage
+  fun:ssl3_HandleHandshake
+  fun:ssl3_HandleRecord
+  fun:ssl3_GatherCompleteHandshake
+  fun:SSL_ForceHandshake
+  fun:_ZN3net18SSLServerSocketNSS11DoHandshakeEv
+}