[Win32] Bug 453845 - Remove unused custom.properties strings. r=jmathies

browser/locales/en-US/installer/custom.properties

@@ -68,7 +68,6 @@ SUMMARY_MAKE_DEFAULT=$BrandShortName will be set as your default web browser.
 SUMMARY_CLICK=Click Install to continue.
 SURVEY_TEXT=&Tell us what you thought of $BrandShortName
 LAUNCH_TEXT=&Launch $BrandShortName now
-WARN_APP_RUNNING_INSTALL=$BrandShortName must be closed to proceed with the installation.\n\nClick "OK" to exit $BrandShortName automatically and continue.
 CREATE_ICONS_DESC=Create icons for $BrandShortName:
 ICONS_DESKTOP=On my &Desktop
 ICONS_STARTMENU=In my &Start Menu Programs folder
@@ -95,7 +94,6 @@ BANNER_CHECK_EXISTING=Checking existing installation…
 
 STATUS_INSTALL_APP=Installing $BrandShortName…
 STATUS_INSTALL_LANG=Installing Language Files (${AB_CD})…
-STATUS_INSTALL_OPTIONAL=Installing Optional Components…
 STATUS_UNINSTALL_MAIN=Uninstalling $BrandShortName…
 STATUS_CLEANUP=A Little Housekeeping…
 
@@ -105,9 +103,6 @@ OPTIONS_SUMMARY=Choose the type of setup you prefer, then click Next.
 # One line
 OPTION_STANDARD_DESC=$BrandShortName will be installed with the most common options.
 OPTION_STANDARD_RADIO=&Standard
-# One line
-OPTION_COMPLETE_DESC=$BrandShortName will be installed with all available options.
-OPTION_COMPLETE_RADIO=C&omplete
 # Two lines
 OPTION_CUSTOM_DESC=You may choose individual options to be installed. Recommended for experienced users.
 OPTION_CUSTOM_RADIO=&Custom