Bug #14815 --> fix some ref counting problems between nsJSPrincipal and nsCodebasePrincipal. nsCodeBasePrinciapl

was always getting leaked. And since it held onto the document's nsIURI, our uri's were getting leaked to.
r=brendan,a=chofmann.

caps/src/nsCodebasePrincipal.cpp

@@ -176,7 +176,6 @@ nsCodebasePrincipal::Init(nsIURI *uri)
         return NS_ERROR_FAILURE;
     }
     // JSPrincipals::Init adopts codebase, so no need to free now
-    NS_ADDREF(this);
     mURI = uri;
     NS_ADDREF(mURI);
     return NS_OK;

caps/src/nsJSPrincipals.cpp

@@ -61,8 +61,6 @@ nsJSPrincipals::~nsJSPrincipals()
 {
     if (codebase)
         PL_strfree(codebase); 
-    if (nsIPrincipalPtr)
-        NS_RELEASE(nsIPrincipalPtr);
 }