Make Apropos functions accept StringRefs.

llvm-svn: 287157
diff --git a/lldb/source/Core/UserSettingsController.cpp b/lldb/source/Core/UserSettingsController.cpp
index 0910f40..00fbc4b 100644
--- a/lldb/source/Core/UserSettingsController.cpp
+++ b/lldb/source/Core/UserSettingsController.cpp
@@ -73,7 +73,7 @@
 }
 
 size_t
-Properties::Apropos(const char *keyword,
+Properties::Apropos(llvm::StringRef keyword,
                     std::vector<const Property *> &matching_properties) const {
   OptionValuePropertiesSP properties_sp(GetValueProperties());
   if (properties_sp) {