base: Remove operator& from ScopedAuthorizationRef.

The operator& is dangerous and makes it unclear what you are doing.
Replace it with a get_pointer() method.

R=Nico
BUG=464816

Review URL: https://codereview.chromium.org/986563003

Cr-Commit-Position: refs/heads/master@{#319565}

base/mac/authorization_util.mm

@@ -28,10 +28,9 @@ AuthorizationRef GetAuthorizationRightsWithPrompt(
     AuthorizationFlags extraFlags) {
   // Create an empty AuthorizationRef.
   ScopedAuthorizationRef authorization;
-  OSStatus status = AuthorizationCreate(NULL,
-                                        kAuthorizationEmptyEnvironment,
+  OSStatus status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
                                         kAuthorizationFlagDefaults,
-                                        &authorization);
+                                        authorization.get_pointer());
   if (status != errAuthorizationSuccess) {
     OSSTATUS_LOG(ERROR, status) << "AuthorizationCreate";
     return NULL;

base/mac/scoped_authorizationref.h

@@ -49,9 +49,7 @@ class ScopedAuthorizationRef {
     return authorization_;
   }
 
-  AuthorizationRef* operator&() {
-    return &authorization_;
-  }
+  AuthorizationRef* get_pointer() { return &authorization_; }
 
   AuthorizationRef get() const {
     return authorization_;