Tweaks to improve memory consumption by TopSites. The biggest culprit

chrome/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2010 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/browser/tab_contents/tab_contents.h"
 
 #include <cmath>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 2554 matching lines @@
 }
 
 void TabContents::UpdateTargetURL(int32 page_id, const GURL& url) {
   if (delegate())
     delegate()->UpdateTargetURL(this, url);
 }
 
 void TabContents::UpdateThumbnail(const GURL& url,
                                   const SkBitmap& bitmap,
                                   const ThumbnailScore& score) {
+  if (profile()->IsOffTheRecord())
+    return;
+
   // Tell History about this thumbnail
   if (history::TopSites::IsEnabled()) {
-    if (!profile()->IsOffTheRecord()) {
-      history::TopSites* ts = profile()->GetTopSites();
-      if (ts)
-        ts->SetPageThumbnail(url, bitmap, score);
-    }
+    history::TopSites* ts = profile()->GetTopSites();
+    if (ts)
+      ts->SetPageThumbnail(url, bitmap, score);
   } else {
-    HistoryService* hs;
-    if (!profile()->IsOffTheRecord() &&
-        (hs = profile()->GetHistoryService(Profile::IMPLICIT_ACCESS))) {
+    HistoryService* hs =
+        profile()->GetHistoryService(Profile::IMPLICIT_ACCESS);
+    if (hs)
       hs->SetPageThumbnail(url, bitmap, score);
-    }
   }
 }
 
 void TabContents::UpdateInspectorSetting(const std::string& key,
                                          const std::string& value) {
   RenderViewHostDelegateHelper::UpdateInspectorSetting(profile(), key, value);
 }
 
 void TabContents::ClearInspectorSettings() {
   RenderViewHostDelegateHelper::ClearInspectorSettings(profile());
@@ skipping 722 matching lines @@
   AddInfoBar(new SavePasswordInfoBarDelegate(this, form_to_save));
 }
 
 Profile* TabContents::GetProfileForPasswordManager() {
   return profile();
 }
 
 bool TabContents::DidLastPageLoadEncounterSSLErrors() {
   return controller().ssl_manager()->ProcessedSSLErrorFromRequest();
 }