Add the Sign-At-Most-Once restriction the enterprise.platformKeys API.

chrome/browser/chromeos/platform_keys/platform_keys_nss.cc

Index: chrome/browser/chromeos/platform_keys/platform_keys_nss.cc
diff --git a/chrome/browser/chromeos/platform_keys/platform_keys_nss.cc b/chrome/browser/chromeos/platform_keys/platform_keys_nss.cc
index 5493e181674be925363dc23b78c39d098cc63d9a..b79a3c0cc88402629f8ad167ae7c66aaf7df2b72 100644
--- a/chrome/browser/chromeos/platform_keys/platform_keys_nss.cc
+++ b/chrome/browser/chromeos/platform_keys/platform_keys_nss.cc
@@ -126,7 +126,7 @@ void GetCertDatabase(const std::string& token_id,
 class GenerateRSAKeyState : public NSSOperationState {
  public:
   GenerateRSAKeyState(unsigned int modulus_length,
-                      const GenerateKeyCallback& callback);
+                      const subtle::GenerateKeyCallback& callback);
   virtual ~GenerateRSAKeyState() {}
 
   virtual void OnError(const tracked_objects::Location& from,
@@ -145,14 +145,14 @@ class GenerateRSAKeyState : public NSSOperationState {
 
  private:
   // Must be called on origin thread, use CallBack() therefore.
-  GenerateKeyCallback callback_;
+  subtle::GenerateKeyCallback callback_;
 };
 
 class SignState : public NSSOperationState {
  public:
   SignState(const std::string& public_key,
             const std::string& data,
-            const SignCallback& callback);
+            const subtle::SignCallback& callback);
   virtual ~SignState() {}
 
   virtual void OnError(const tracked_objects::Location& from,
@@ -172,7 +172,7 @@ class SignState : public NSSOperationState {
 
  private:
   // Must be called on origin thread, use CallBack() therefore.
-  SignCallback callback_;
+  subtle::SignCallback callback_;
 };
 
 class GetCertificatesState : public NSSOperationState {
@@ -251,14 +251,15 @@ NSSOperationState::NSSOperationState()
     : origin_task_runner_(base::ThreadTaskRunnerHandle::Get()) {
 }
 
-GenerateRSAKeyState::GenerateRSAKeyState(unsigned int modulus_length,
-                                         const GenerateKeyCallback& callback)
+GenerateRSAKeyState::GenerateRSAKeyState(
+    unsigned int modulus_length,
+    const subtle::GenerateKeyCallback& callback)
     : modulus_length_(modulus_length), callback_(callback) {
 }
 
 SignState::SignState(const std::string& public_key,
                      const std::string& data,
-                     const SignCallback& callback)
+                     const subtle::SignCallback& callback)
     : public_key_(public_key), data_(data), callback_(callback) {
 }
 
@@ -468,6 +469,8 @@ void RemoveCertificateWithDB(scoped_ptr<RemoveCertificateState> state,
 
 }  // namespace
 
+namespace subtle {
+
 void GenerateRSAKey(const std::string& token_id,
                     unsigned int modulus_length,
                     const GenerateKeyCallback& callback,
@@ -508,6 +511,8 @@ void Sign(const std::string& token_id,
                   state_ptr);
 }
 
+}  // namespace subtle
+
 void GetCertificates(const std::string& token_id,
                      const GetCertificatesCallback& callback,
                      Profile* profile) {