Inject CanAddURLToHistory into TopSitesImpl

tools/valgrind/memcheck/suppressions_mac.txt

 # There are three kinds of suppressions in this file:
 # 1. Third party stuff we have no control over.
 #
 # 2. Intentional unit test errors, 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.
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 262 matching lines @@
 }
 {
    bug_464850
    Memcheck:Uninitialized
    fun:_ZN2v88internal9ExitFrame23GetStateForFramePointerEPhPNS0_10StackFrame5StateE
    fun:_ZN2v88internal18StackFrameIterator5ResetEPNS0_14ThreadLocalTopE
    fun:_ZN2v88internal18StackFrameIteratorC2EPNS0_7IsolateE
    fun:_ZN2v88internal18StackFrameIteratorC1EPNS0_7IsolateE
    fun:_ZN2v88internal7Isolate11FindHandlerEv
 }
+{
+   bug_481286a
+   Memcheck:Leak
+   ...
+   fun:CSSM_CL_CertGetFirstCachedFieldValue
+   ...
+   fun:SecTrustEvaluate
+}
+{
+   bug_481286b
+   Memcheck:Leak
+   ...
+   fun:CSSM_CL_CertGetFirstCachedFieldValue
+   fun:_ZN8Security12KeychainCore11Certificate19copyFirstFieldValueERK9cssm_data
+   fun:_ZN8Security12KeychainCore11Certificate9publicKeyEv
+   fun:SecCertificateCopyPublicKey
+   fun:_ZN3net15X509Certificate16GetPublicKeyInfoEP23OpaqueSecCertificateRef*
+}