Revise about: and chrome: url handling.

chrome/browser/history/history.cc

 // Copyright (c) 2011 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.
 
 // The history system runs on a background thread so that potentially slow
 // database operations don't delay the browser. This backend processing is
 // represented by HistoryBackend. The HistoryService's job is to dispatch to
 // that thread.
 //
 // Main thread                       History thread
@@ skipping 686 matching lines @@
   // TODO: We should allow kChromeUIScheme URLs if they have been explicitly
   // typed.  Right now, however, these are marked as typed even when triggered
   // by a shortcut or menu action.
   if (url.SchemeIs(chrome::kJavaScriptScheme) ||
       url.SchemeIs(chrome::kChromeDevToolsScheme) ||
       url.SchemeIs(chrome::kChromeUIScheme) ||
       url.SchemeIs(chrome::kViewSourceScheme) ||
       url.SchemeIs(chrome::kChromeInternalScheme))
     return false;
 
-  if (url.SchemeIs(chrome::kAboutScheme)) {
-    if (LowerCaseEqualsASCII(url.path(), "blank"))
-      return false;
-    // We allow all other about URLs since the user may like to see things
-    // like "about:memory" or "about:histograms" in their history and
-    // autocomplete.
-  }
+  // Allow all about: and chrome: URLs except about:blank, since the user may
+  // like to see "chrome://memory/", etc. in their history and autocomplete.
+  if (url == GURL(chrome::kAboutBlankURL))
+    return false;
 
   return true;
 }
 
 void HistoryService::SetInMemoryBackend(
     history::InMemoryHistoryBackend* mem_backend) {
   DCHECK(!in_memory_backend_.get()) << "Setting mem DB twice";
   in_memory_backend_.reset(mem_backend);
 
   // The database requires additional initialization once we own it.
@@ skipping 89 matching lines @@
     history::TopSites* ts = profile_->GetTopSitesWithoutCreating();
     if (ts)
       ts->MigrateFromHistory();
   }
 }
 
 void HistoryService::OnTopSitesReady() {
   ScheduleAndForget(PRIORITY_NORMAL,
                     &HistoryBackend::MigrateThumbnailsDatabase);
 }