Recheckin in after trifle request to backout two minutes before the tree

reopened.
Original Comment:
fix for 29013. Correcting problem with AddDirectory API. r=dveditz.
a=cathleen.

xpinstall/src/nsInstall.cpp

@@ -157,7 +157,7 @@ nsInstall::nsInstall(nsIZipReader * theJARFile)
     mStartInstallCompleted  = PR_FALSE;
     mJarFileLocation        = "";
     mInstallArguments       = "";
-
+    mPackageFolder          = nsnull;
 
     // mJarFileData is an opaque handle to the jarfile.
     mJarFileData = theJARFile;
@@ -194,6 +194,9 @@ nsInstall::~nsInstall()
     if (mVersionInfo != nsnull)
         delete mVersionInfo;
 
+    if (mPackageFolder)
+        delete mPackageFolder;
+
     MOZ_COUNT_DTOR(nsInstall);
 }
 
@@ -798,11 +801,15 @@ nsInstall::FinalizeInstall(PRInt32* aReturn)
         if (mVersionInfo)
         {
             nsString versionString;
+            nsString path;
 
             mVersionInfo->ToString(versionString);
 
+            if (mPackageFolder)
+                mPackageFolder->GetDirectoryPath(path);
+
             VR_Install( (char*)(const char*)nsAutoCString(mRegistryPackageName), 
-                        nsnull,  
+                        (char*)(const char*)nsAutoCString(path),   
                         (char*)(const char*)nsAutoCString(versionString), 
                         PR_FALSE );
         }
@@ -1331,6 +1338,9 @@ nsInstall::ResetError()
 PRInt32    
 nsInstall::SetPackageFolder(nsInstallFolder& aFolder)
 {
+    if (mPackageFolder)
+        delete mPackageFolder;
+    
     mPackageFolder = new nsInstallFolder(aFolder, "");
 
     return NS_OK;