Fix ProxyResolverV8Test after V8 roll

BUG=480652
TBR=asanka@chromium.org

Review URL: https://codereview.chromium.org/1124293003

Cr-Commit-Position: refs/heads/master@{#330359}

net/proxy/proxy_resolver_v8_unittest.cc

@@ -283,8 +283,7 @@ TEST(ProxyResolverV8Test, ParseError) {
 
   EXPECT_EQ("Uncaught SyntaxError: Unexpected end of input",
             bindings->errors[0]);
-  // TODO: replace expected value with 5 after V8 roll
-  // EXPECT_EQ(0, bindings->errors_line_number[0]);
+  EXPECT_EQ(5, bindings->errors_line_number[0]);
 }
 
 // Run a PAC script several times, which has side-effects.