Renaming poorly named classes and adding missing unit tests.

chrome/renderer/prerender/prerender_dispatcher.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/prerender/prerender_dispatcher.h"
 
 #include "base/logging.h"
 #include "chrome/common/prerender_messages.h"
 #include "chrome/renderer/prerender/prerendering_support.h"
 #include "googleurl/src/gurl.h"
@@ skipping 21 matching lines @@
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
   return handled;
 }
 
 void PrerenderDispatcher::OnAddPrerenderURL(const GURL& url) {
   PrerenderMap::iterator it = prerender_urls_.find(url);
   if (it != prerender_urls_.end()) {
     DCHECK(it->second > 0);
-    it->second += 1;
+    ++it->second;
   } else {
     prerender_urls_[url] = 1;
   }
 }
 
 void PrerenderDispatcher::OnRemovePrerenderURL(const GURL& url) {
   PrerenderMap::iterator it = prerender_urls_.find(url);
   // This is possible with a spurious remove.
   // TODO(cbentzel): We'd also want to send the map of active prerenders when
   // creating a new render process, so the Add/Remove go relative to that.
   // This may not be that big of a deal in practice, since the newly created tab
   // is unlikely to go to the prerendered page.
   if (it == prerender_urls_.end())
     return;
   DCHECK(it->second > 0);
-  it->second -= 1;
+  --it->second;
   if (it->second == 0)
     prerender_urls_.erase(it);
 }
 
 }  // namespace prerender