Remove NPAPI command line flags entirely.

content/shell/browser/shell_content_browser_client.cc

Index: content/shell/browser/shell_content_browser_client.cc
diff --git a/content/shell/browser/shell_content_browser_client.cc b/content/shell/browser/shell_content_browser_client.cc
index fd8a49c875a54abda214062ba4d719e61bc4969f..ff5503f5b62c2fa76eaa84c17eee321d90d6a3ce 100644
--- a/content/shell/browser/shell_content_browser_client.cc
+++ b/content/shell/browser/shell_content_browser_client.cc
@@ -201,6 +201,14 @@ bool ShellContentBrowserClient::IsHandledURL(const GURL& url) {
   return false;
 }
 
+bool ShellContentBrowserClient::IsNPAPIEnabled() {
+#if defined(OS_WIN) || defined(OS_MACOSX)
+  return true;
+#else
+  return false;
+#endif
+}
+
 void ShellContentBrowserClient::AppendExtraCommandLineSwitches(
     base::CommandLine* command_line,
     int child_process_id) {