Make TrustStore into an interface, move impl to TrustStoreInMemory.

components/cast_certificate/cast_crl.cc

Index: components/cast_certificate/cast_crl.cc
diff --git a/components/cast_certificate/cast_crl.cc b/components/cast_certificate/cast_crl.cc
index e9233952d6a943d511cc38fcb57638699f1f6915..f91c7ece763268ec42ac644b2056b0eed106817c 100644
--- a/components/cast_certificate/cast_crl.cc
+++ b/components/cast_certificate/cast_crl.cc
@@ -17,7 +17,7 @@
 #include "net/cert/internal/path_builder.h"
 #include "net/cert/internal/signature_algorithm.h"
 #include "net/cert/internal/signature_policy.h"
-#include "net/cert/internal/trust_store.h"
+#include "net/cert/internal/trust_store_static.h"
 #include "net/cert/internal/verify_certificate_chain.h"
 #include "net/cert/internal/verify_signed_data.h"
 #include "net/cert/x509_certificate.h"
@@ -75,7 +75,7 @@ class CastCRLTrustStore {
     store_.AddTrustAnchor(std::move(anchor));
   }
 
-  net::TrustStore store_;
+  net::TrustStoreStatic store_;
   DISALLOW_COPY_AND_ASSIGN(CastCRLTrustStore);
 };