Move themes garbage-collection out of shutdown code.

chrome/browser/themes/browser_theme_provider.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/themes/browser_theme_provider.h"
 
 #include "app/resource_bundle.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 178 matching lines @@
 BrowserThemeProvider::BrowserThemeProvider()
     : rb_(ResourceBundle::GetSharedInstance()),
       profile_(NULL),
       number_of_infobars_(0) {
   // Initialize the themeable image map so we can use it on other threads.
   HasThemeableImage(0);
 }
 
 BrowserThemeProvider::~BrowserThemeProvider() {
   FreePlatformCaches();
-
-  RemoveUnusedThemes();
 }
 
 void BrowserThemeProvider::Init(Profile* profile) {
   DCHECK(CalledOnValidThread());
   profile_ = profile;
 
   LoadThemePrefs();
 }
 
 SkBitmap* BrowserThemeProvider::GetBitmapNamed(int id) const {
@@ skipping 413 matching lines @@
 void BrowserThemeProvider::OnInfobarDisplayed() {
   number_of_infobars_++;
 }
 
 void BrowserThemeProvider::OnInfobarDestroyed() {
   number_of_infobars_--;
 
   if (number_of_infobars_ == 0)
     RemoveUnusedThemes();
 }