Add missing comma.

We'd skip a test as the two strings would get joined, add the missing
comma so all tests are run correctly.

Found by: etienneb@

R=etienneb@chromium.org

Review URL: https://codereview.chromium.org/1826193002 .
diff --git a/core/fpdftext/fpdf_text_int_unittest.cpp b/core/fpdftext/fpdf_text_int_unittest.cpp
index c1c29cd..1510ebc 100644
--- a/core/fpdftext/fpdf_text_int_unittest.cpp
+++ b/core/fpdftext/fpdf_text_int_unittest.cpp
@@ -19,7 +19,7 @@
   // Check cases that fail to extract valid mail link.
   const wchar_t* invalid_strs[] = {
       L"",
-      L"peter.pan"        // '@' is required.
+      L"peter.pan",       // '@' is required.
       L"abc@server",      // Domain name needs at least one '.'.
       L"abc.@gmail.com",  // '.' can not immediately precede '@'.
       L"abc@xyz&q.org",   // Domain name should not contain '&'.