Linux: fix a bunch of NULL vs. 0 issues spotted by gcc 4.5.

chrome/browser/gtk/options/languages_page_gtk_unittest.cc

 // Copyright (c) 2006-2008 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/gtk/options/languages_page_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include "base/message_loop.h"
 #include "base/string_util.h"
@@ skipping 238 matching lines @@
   EXPECT_EQ(FALSE, gtk_toggle_button_get_active(
       GTK_TOGGLE_BUTTON(page.enable_spellchecking_checkbox_)));
 
   profile_->GetPrefs()->SetBoolean(prefs::kEnableSpellCheck, true);
   EXPECT_EQ(TRUE, gtk_toggle_button_get_active(
       GTK_TOGGLE_BUTTON(page.enable_spellchecking_checkbox_)));
 
   gtk_button_clicked(GTK_BUTTON(page.enable_spellchecking_checkbox_));
   EXPECT_EQ(FALSE, gtk_toggle_button_get_active(
       GTK_TOGGLE_BUTTON(page.enable_spellchecking_checkbox_)));
-  EXPECT_EQ(false, profile_->GetPrefs()->GetBoolean(prefs::kEnableSpellCheck));
+  EXPECT_FALSE(profile_->GetPrefs()->GetBoolean(prefs::kEnableSpellCheck));
 
   gtk_button_clicked(GTK_BUTTON(page.enable_spellchecking_checkbox_));
   EXPECT_EQ(TRUE, gtk_toggle_button_get_active(
       GTK_TOGGLE_BUTTON(page.enable_spellchecking_checkbox_)));
   EXPECT_EQ(true, profile_->GetPrefs()->GetBoolean(prefs::kEnableSpellCheck));
 }
 
 // TODO(mattm): add EnableAutoSpellChecking test
 
 TEST_F(LanguagesPageGtkTest, DictionaryLanguage) {
@@ skipping 30 matching lines @@
   EXPECT_STREQ("French", GetDisplayedSpellCheckerLang(page).c_str());
 
   gtk_combo_box_set_active(
         GTK_COMBO_BOX(page.dictionary_language_combobox_),
         page.dictionary_language_model_->GetIndexFromLocale("it"));
   EXPECT_STREQ("Italian", GetDisplayedLangs(page).c_str());
   EXPECT_STREQ("it",
       profile_->GetPrefs()->GetString(prefs::kAcceptLanguages).c_str());
   EXPECT_STREQ("Italian", GetDisplayedSpellCheckerLang(page).c_str());
 }