Use checked_cast<> to avoid compile errors on Windows

media/cdm/stub/stub_cdm.cc

 // Copyright 2015 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 "media/cdm/stub/stub_cdm.h"
 
 #include "base/logging.h"
+#include "base/numerics/safe_conversions.h"
 #include "base/strings/string_number_conversions.h"
 
 // Version number for this stub. The third number represents the
 // cdm::ContentDecryptionModule version.
 const char kStubCdmVersion[] = "1.4.8.0";
 
 void INITIALIZE_CDM_MODULE() {
 }
 
 void DeinitializeCdmModule() {
@@ skipping 36 matching lines @@
 
 void StubCdm::CreateSessionAndGenerateRequest(
     uint32 promise_id,
     cdm::SessionType /* session_type */,
     cdm::InitDataType /* init_data_type */,
     const uint8* /* init_data */,
     uint32 /* init_data_size */) {
   // Provide a dummy message (with a trivial session ID) to enable some testing
   // and be consistent with existing testing without a license server.
   std::string session_id(base::UintToString(next_session_id_++));
-  host_->OnResolveNewSessionPromise(promise_id, session_id.data(),
-                                    session_id.length());
-  host_->OnSessionMessage(session_id.data(), session_id.length(),
+  host_->OnResolveNewSessionPromise(
+      promise_id, session_id.data(),
+      base::checked_cast<uint32_t>(session_id.length()));
+  host_->OnSessionMessage(session_id.data(),
+                          base::checked_cast<uint32_t>(session_id.length()),
                           cdm::kLicenseRequest, nullptr, 0, nullptr, 0);
 }
 
 void StubCdm::LoadSession(uint32 promise_id,
                           cdm::SessionType /* session_type */,
                           const char* /* session_id */,
                           uint32_t /* session_id_length */) {
   FailRequest(promise_id);
 }
 
@@ skipping 72 matching lines @@
 void StubCdm::OnQueryOutputProtectionStatus(
     cdm::QueryResult /* result */,
     uint32_t /* link_mask */,
     uint32_t /* output_protection_mask */) {
   NOTREACHED();
 };
 
 void StubCdm::FailRequest(uint32 promise_id) {
   std::string message("Operation not supported by stub CDM.");
   host_->OnRejectPromise(promise_id, cdm::kInvalidAccessError, 0,
-                         message.data(), message.length());
+                         message.data(),
+                         base::checked_cast<uint32_t>(message.length()));
 }
 
 }  // namespace media