Remove kEnablePrintPreview now that the pdf plugin is part of Chromium.

chrome/common/chrome_switches.h

 // 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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
 #include "build/build_config.h"
@@ skipping 82 matching lines @@
 extern const char kDisableMinimizeOnSecondLauncherItemClick[];
 extern const char kDisableNTPOtherSessionsMenu[];
 extern const char kDisableOfflineAutoReload[];
 extern const char kDisableOriginChip[];
 extern const char kDisablePasswordManagerReauthentication[];
 extern const char kDisablePeopleSearch[];
 extern const char kDisablePnacl[];
 extern const char kDisablePopupBlocking[];
 extern const char kDisablePreconnect[];
 extern const char kDisablePrerenderLocalPredictor[];
+extern const char kDisablePrintPreview[];
 extern const char kDisablePromptOnRepost[];
 extern const char kDisableQuic[];
 extern const char kDisableQuicHttps[];
 extern const char kDisableQuicPacing[];
 extern const char kDisableQuicPortSelection[];
 extern const char kDisableQuicTimeBasedLossDetection[];
 extern const char kDisableRestoreBackgroundContents[];
 extern const char kDisableSavePasswordBubble[];
 extern const char kDisableSearchButtonInOmnibox[];
 extern const char kDisableScriptedPrintThrottling[];
@@ skipping 286 matching lines @@
 #endif
 
 #if defined(ENABLE_FULL_PRINTING) && !defined(OFFICIAL_BUILD)
 extern const char kDebugPrint[];
 #endif
 
 #ifndef NDEBUG
 extern const char kFileManagerExtensionPath[];
 #endif
 
-#if defined(GOOGLE_CHROME_BUILD)
-extern const char kDisablePrintPreview[];
-#else
-extern const char kEnablePrintPreview[];
-#endif
-
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_