Add compile time checks against longs being used in IPC structs on 32 bit Android.

extensions/renderer/extensions_render_frame_observer.cc

Index: extensions/renderer/extensions_render_frame_observer.cc
diff --git a/extensions/renderer/extensions_render_frame_observer.cc b/extensions/renderer/extensions_render_frame_observer.cc
index dd94caff881caf50ef54ebd0243de81ccc103658..3f66f46256a2025ffeb6cee34962dbd241f03711 100644
--- a/extensions/renderer/extensions_render_frame_observer.cc
+++ b/extensions/renderer/extensions_render_frame_observer.cc
@@ -85,7 +85,7 @@ void ExtensionsRenderFrameObserver::DetailedConsoleMessageAdded(
     const base::string16& message,
     const base::string16& source,
     const base::string16& stack_trace_string,
-    int32_t line_number,
+    uint32_t line_number,
     int32_t severity_level) {
   base::string16 trimmed_message = message;
   StackTrace stack_trace = GetStackTraceFromMessage(