Convert 0 to nullptr in content using clang-tidy.

Bug: 778942
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: Iee6be84c23149c745b3afd6e6158764f92ccd17f
Reviewed-on: https://chromium-review.googlesource.com/732305
Reviewed-by: Daniel Cheng <[email protected]>
Reviewed-by: Jochen Eisinger <[email protected]>
Commit-Queue: Ivan Kotenkov <[email protected]>
Cr-Commit-Position: refs/heads/master@{#513138}
diff --git a/content/shell/test_runner/event_sender.cc b/content/shell/test_runner/event_sender.cc
index b5ad2166..a6f966d 100644
--- a/content/shell/test_runner/event_sender.cc
+++ b/content/shell/test_runner/event_sender.cc
@@ -425,7 +425,7 @@
   static const char* kNonEditableMenuStrings[] = {
       "Back",        "Reload Page",     "Open in Dashbaord",
       "<separator>", "View Source",     "Save Page As",
-      "Print Page",  "Inspect Element", 0};
+      "Print Page",  "Inspect Element", nullptr};
   static const char* kEditableMenuStrings[] = {"Cut",
                                                "Copy",
                                                "<separator>",
@@ -436,7 +436,7 @@
                                                "Speech",
                                                "Paragraph Direction",
                                                "<separator>",
-                                               0};
+                                               nullptr};
 
   // This is possible because mouse events are cancelleable.
   if (!context_menu)