[NaCl SDK Docs] Simplify PPAPI documentation generation.

native_client_sdk/src/doc/doxygen/stylesheet.css

 /*
  * Based off the Doxygen generated template stylesheet and trimmed/edited to
  * remove items that would conflict with codesite or other overlying
  * stylesheets while maintaining the desired look and feel.
  *
  * The #doxygen-ref is an id tag which encompasses code generated by doxygen
  * and allows override of standard html tags while not affecting the rest
  * of the page such as sidebars.
  */
 
@@ skipping 225 matching lines @@
   text-align: right;
 }
 .memdoc {
   padding-left: 30px;
 }
 .memitem {
   border-top:1px solid #E5ECF9;
 }
 .doxygen-global {
   background-color: #ffcc66;
-}
+}