Don't run platform diagnostics tool on invalid URLs from the renderer.

chrome/browser/net/net_error_tab_helper_unittest.cc

Index: chrome/browser/net/net_error_tab_helper_unittest.cc
diff --git a/chrome/browser/net/net_error_tab_helper_unittest.cc b/chrome/browser/net/net_error_tab_helper_unittest.cc
index 05cfaa1cb6d5d4c48033349210ba5f27aa31c8c3..d8b9b5d8641f04533a7eaba79e15712a44ad0494 100644
--- a/chrome/browser/net/net_error_tab_helper_unittest.cc
+++ b/chrome/browser/net/net_error_tab_helper_unittest.cc
@@ -421,9 +421,12 @@ TEST_F(NetErrorTabHelperTest, SanitizeDiagnosticsUrl) {
             tab_helper()->network_diagnostics_url());
 }
 
-// Makes sure that diagnostics aren't run on URLS with non-HTTP/HTTPS schemes.
+// Makes sure that diagnostics aren't run on invalid URLs or URLs with
+// non-HTTP/HTTPS schemes.
 TEST_F(NetErrorTabHelperTest, NoDiagnosticsForNonHttpSchemes) {
   const char* kUrls[] = {
+    "",
+    "http",
     "file:///blah/blah",
     "chrome://blah/",
     "about:blank",