Adding additional include path to using_google_update.vsprops.

Needed by several projects down in installer, due to recent gyp switch.

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/118104

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17386 0039d316-1c4b-4281-b951-d872f2087c98

google_update/using_google_update.vsprops

@@ -6,6 +6,6 @@
 	>
 	<Tool
 		Name="VCCLCompilerTool"
-		AdditionalIncludeDirectories="$(IntDir)\..\ondemand_updates;"
+		AdditionalIncludeDirectories="$(IntDir)\..\ondemand_updates;$(IntDir)\..\google_update"
 	/>
 </VisualStudioPropertySheet>