Fix 64-bit Mac compilation errors in src/crypto.

crypto/mock_keychain_mac.h

Index: crypto/mock_keychain_mac.h
===================================================================
--- crypto/mock_keychain_mac.h	(revision 147091)
+++ crypto/mock_keychain_mac.h	(working copy)
@@ -151,32 +151,33 @@
   // Initializes storage for keychain data at |key|.
   void InitializeKeychainData(unsigned int key) const;
   // Sets the data and length of |tag| in the item-th test item.
-  void SetTestDataBytes(int item, UInt32 tag, const void* data, size_t length);
+  void SetTestDataBytes(unsigned int item, UInt32 tag,
+                        const void* data, size_t length);
   // Sets the data and length of |tag| in the item-th test item based on
   // |value|. The null-terminator will not be included; the Keychain Services
   // docs don't indicate whether it is or not, so clients should not assume
   // that it will be.
-  void SetTestDataString(int item, UInt32 tag, const char* value);
+  void SetTestDataString(unsigned int item, UInt32 tag, const char* value);
   // Sets the data of the corresponding attribute of the item-th test item to
   // |value|. Assumes that the space has alread been allocated, and the length
   // set.
-  void SetTestDataPort(int item, UInt32 value);
-  void SetTestDataProtocol(int item, SecProtocolType value);
-  void SetTestDataAuthType(int item, SecAuthenticationType value);
-  void SetTestDataNegativeItem(int item, Boolean value);
-  void SetTestDataCreator(int item, OSType value);
+  void SetTestDataPort(unsigned int item, UInt32 value);
+  void SetTestDataProtocol(unsigned int item, SecProtocolType value);
+  void SetTestDataAuthType(unsigned int item, SecAuthenticationType value);
+  void SetTestDataNegativeItem(unsigned int item, Boolean value);
+  void SetTestDataCreator(unsigned int item, OSType value);
   // Sets the password data and length for the item-th test item.
-  void SetTestDataPasswordBytes(int item, const void* data, size_t length);
+  void SetTestDataPasswordBytes(unsigned int item, const void* data, size_t length);
   // Sets the password for the item-th test item. As with SetTestDataString,
   // the data will not be null-terminated.
-  void SetTestDataPasswordString(int item, const char* value);
+  void SetTestDataPasswordString(unsigned int item, const char* value);
 
   // Returns the address of the attribute in attribute_list with tag |tag|.
   static SecKeychainAttribute* AttributeWithTag(
       const SecKeychainAttributeList& attribute_list,
       UInt32 tag);
 
-  static const int kDummySearchRef = 1000;
+  static const unsigned int kDummySearchRef = 1000;
 
   typedef struct KeychainPasswordData {
     KeychainPasswordData() : data(NULL), length(0) {}