Move app_host target from c/b/extensions into src/apps.

apps/app_host/binaries_installer.h

Index: apps/app_host/binaries_installer.h
diff --git a/chrome/browser/extensions/app_host/binaries_installer.h b/apps/app_host/binaries_installer.h
similarity index 69%
rename from chrome/browser/extensions/app_host/binaries_installer.h
rename to apps/app_host/binaries_installer.h
index 7d6ff198859a31088a9384ce3601bb109af71b94..8c70146c2fc5b671b7e351aca7ca5642c81dc8de 100644
--- a/chrome/browser/extensions/app_host/binaries_installer.h
+++ b/apps/app_host/binaries_installer.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_EXTENSIONS_APP_HOST_BINARIES_INSTALLER_H_
-#define CHROME_BROWSER_EXTENSIONS_APP_HOST_BINARIES_INSTALLER_H_
+#ifndef APPS_APP_HOST_BINARIES_INSTALLER_H_
+#define APPS_APP_HOST_BINARIES_INSTALLER_H_
 
 #include <windows.h>
 
@@ -16,4 +16,4 @@ HRESULT InstallBinaries();
 
 }  // namespace app_host
 
-#endif  // CHROME_BROWSER_EXTENSIONS_APP_HOST_BINARIES_INSTALLER_H_
+#endif  // APPS_APP_HOST_BINARIES_INSTALLER_H_