Make TrustStore into an interface, move impl to TrustStoreInMemory.

net/cert/internal/trust_store_static.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/cert/internal/trust_store_static.h"
+
+namespace net {
+
+TrustStoreStatic::TrustStoreStatic() = default;
+TrustStoreStatic::~TrustStoreStatic() = default;
+
+void TrustStoreStatic::Clear() {
+  anchors_.clear();
+}
+
+void TrustStoreStatic::AddTrustAnchor(scoped_refptr<TrustAnchor> anchor) {
+  // TODO(mattm): should this check for duplicate anchors?
+  anchors_.insert(std::make_pair(anchor->normalized_subject().AsStringPiece(),
+                                 std::move(anchor)));
+}
+
+void TrustStoreStatic::FindTrustAnchorsByNormalizedName(
+    const der::Input& normalized_name,
+    TrustAnchors* matches) const {
+  auto range = anchors_.equal_range(normalized_name.AsStringPiece());
+  for (auto it = range.first; it != range.second; ++it)
+    matches->push_back(it->second);
+}
+
+}  // namespace net