Mojo docs cleanup and add C++ struct/enum/union

Removes the silly Mojo "logo" thing because it's
unnecessary and breaks the title parsing logic in
gitiles markdown viewer.

BUG=None
[email protected]

Change-Id: I78d2139d64b1e6477b3284434d5022ff45070e89
Reviewed-on: https://chromium-review.googlesource.com/487262
Commit-Queue: Ken Rockot <[email protected]>
Reviewed-by: Ken Rockot <[email protected]>
Cr-Commit-Position: refs/heads/master@{#467179}
diff --git a/mojo/public/java/system/README.md b/mojo/public/java/system/README.md
index c62f30b..373009c5 100644
--- a/mojo/public/java/system/README.md
+++ b/mojo/public/java/system/README.md
@@ -1,4 +1,4 @@
-# ![Mojo Graphic](https://goo.gl/e0Hpks) Mojo Java System API
+# Mojo Java System API
 This document is a subset of the [Mojo documentation](/mojo).
 
 [TOC]