Accept only OnceCallbacks in PlatformKeysService interface

Bug: 1130594
Change-Id: I815675d485a40f7131e48908cd1f25d8f20c74d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421459Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Omar Morsi <omorsi@google.com>
Cr-Commit-Position: refs/heads/master@{#809232}

chrome/browser/chromeos/cert_provisioning/cert_provisioning_test_helpers.cc

@@ -57,7 +57,7 @@ CertificateHelperForTesting::~CertificateHelperForTesting() = default;
 
 void CertificateHelperForTesting::GetCertificates(
     platform_keys::TokenId token_id,
-    const platform_keys::GetCertificatesCallback& callback) {
+    platform_keys::GetCertificatesCallback callback) {
   auto result = std::make_unique<net::CertificateList>();
   *result = cert_list_;
   std::move(callback).Run(std::move(result), platform_keys::Status::kSuccess);

chrome/browser/chromeos/cert_provisioning/cert_provisioning_test_helpers.h

@@ -63,7 +63,7 @@ struct CertificateHelperForTesting {
 
  private:
   void GetCertificates(platform_keys::TokenId token_id,
-                       const platform_keys::GetCertificatesCallback& callback);
+                       platform_keys::GetCertificatesCallback callback);
 
   platform_keys::MockPlatformKeysService* platform_keys_service_ = nullptr;
   scoped_refptr<net::X509Certificate> template_cert_;

chrome/browser/chromeos/platform_keys/mock_platform_keys_service.h

@@ -39,14 +39,14 @@ class MockPlatformKeysService : public PlatformKeysService {
               GenerateRSAKey,
               (TokenId token_id,
                unsigned int modulus_length_bits,
-               const GenerateKeyCallback& callback),
+               GenerateKeyCallback callback),
               (override));
 
   MOCK_METHOD(void,
               GenerateECKey,
               (TokenId token_id,
                const std::string& named_curve,
-               const GenerateKeyCallback& callback),
+               GenerateKeyCallback callback),
               (override));
 
   MOCK_METHOD(void,
@@ -55,7 +55,7 @@ class MockPlatformKeysService : public PlatformKeysService {
                const std::string& data,
                const std::string& public_key_spki_der,
                HashAlgorithm hash_algorithm,
-               const SignCallback& callback),
+               SignCallback callback),
               (override));
 
   MOCK_METHOD(void,
@@ -63,7 +63,7 @@ class MockPlatformKeysService : public PlatformKeysService {
               (base::Optional<TokenId> token_id,
                const std::string& data,
                const std::string& public_key_spki_der,
-               const SignCallback& callback),
+               SignCallback callback),
               (override));
 
   MOCK_METHOD(void,
@@ -72,18 +72,18 @@ class MockPlatformKeysService : public PlatformKeysService {
                const std::string& data,
                const std::string& public_key_spki_der,
                HashAlgorithm hash_algorithm,
-               const SignCallback& callback),
+               SignCallback callback),
               (override));
 
   MOCK_METHOD(void,
               SelectClientCertificates,
               (const std::vector<std::string>& certificate_authorities,
-               const SelectCertificatesCallback& callback),
+               SelectCertificatesCallback callback),
               (override));
 
   MOCK_METHOD(void,
               GetCertificates,
-              (TokenId token_id, const GetCertificatesCallback& callback),
+              (TokenId token_id, GetCertificatesCallback callback),
               (override));
 
   MOCK_METHOD(void,
@@ -95,14 +95,14 @@ class MockPlatformKeysService : public PlatformKeysService {
               ImportCertificate,
               (TokenId token_id,
                const scoped_refptr<net::X509Certificate>& certificate,
-               const ImportCertificateCallback& callback),
+               ImportCertificateCallback callback),
               (override));
 
   MOCK_METHOD(void,
               RemoveCertificate,
               (TokenId token_id,
                const scoped_refptr<net::X509Certificate>& certificate,
-               const RemoveCertificateCallback& callback),
+               RemoveCertificateCallback callback),
               (override));
 
   MOCK_METHOD(void,
@@ -117,7 +117,7 @@ class MockPlatformKeysService : public PlatformKeysService {
   MOCK_METHOD(void,
               GetKeyLocations,
               (const std::string& public_key_spki_der,
-               const GetKeyLocationsCallback& callback),
+               GetKeyLocationsCallback callback),
               (override));
 
   MOCK_METHOD(void,