Make the browser->metro_viewer IPC channel name a constant instead of hardcoding it in a few places…

chrome/common/chrome_switches.cc

 // 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.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 
 namespace switches {
@@ skipping 1463 matching lines @@
 const char kUseSimpleCacheBackend[]         = "use-simple-cache-backend";
 
 // Specifies a custom URL for the server which reports variation data to the
 // client. Specifying this switch enables the Variations service on
 // unofficial builds. See variations_service.cc.
 const char kVariationsServerURL[]           = "variations-server-url";
 
 // Prints version information and quits.
 const char kVersion[]                       = "version";
 
-// Requests that Chrome connect to a remote viewer process using an IPC
-// channel of the given name.
-const char kViewerConnection[]              = "viewer-connection";
-
 // Cycle through a series of URLs listed in the specified file.
 const char kVisitURLs[]                     = "visit-urls";
 
 // Adds the given extension ID to all the permission whitelists.
 const char kWhitelistedExtensionID[]        = "whitelisted-extension-id";
 
 // Specify the initial window position: --window-position=x,y
 const char kWindowPosition[]                = "window-position";
 
 // Specify the initial window size: --window-size=w,h
@@ skipping 100 matching lines @@
 
 // Waits for the given handle to be signaled before relaunching metro Chrome on
 // Windows 8 and higher.
 const char kWaitForMutex[]                  = "wait-for-mutex";
 
 // Indicates that chrome was launched to service a search request in Windows 8.
 const char kWindows8Search[]           = "windows8-search";
 
 #endif
 
+#if defined(OS_WIN) && defined(USE_AURA)
+// Requests that Chrome connect to the running Metro viewer process.
+const char kViewerConnect[]                 = "viewer-connect";
+#endif
+
 #ifndef NDEBUG
 // Enables overriding the path of file manager extension.
 const char kFileManagerExtensionPath[]      = "filemgr-ext-path";
 
 // Enables overriding the path of image loader extension.
 const char kImageLoaderExtensionPath[]      = "image-loader-ext-path";
 #endif  // NDEBUG
 
 // Controls print preview in the browser process.
 #if defined(GOOGLE_CHROME_BUILD)
 // Disables print preview (For testing, and for users who don't like us. :[ )
 const char kDisablePrintPreview[]           = "disable-print-preview";
 #else
 // Enables print preview (Force enable on Chromium, which normally does not
 //                        have the PDF viewer required for print preview.)
 const char kEnablePrintPreview[]            = "enable-print-preview";
 #endif
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR CRAP TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches