for bug 112708, sr=dveditz, r=bnesse convert prefapi.c to C++

modules/libpref/src/Makefile.in

@@ -44,13 +44,12 @@ REQUIRES	= xpcom \
 
 include $(topsrcdir)/config/config.mk
 
-CSRCS		= prefapi.c
-
 CPPSRCS		= nsPref.cpp \
 			  nsPrefBranch.cpp	\
 			  nsPrefService.cpp	\
 			  nsPrefsFactory.cpp	\
 			  nsAutoConfig.cpp      \
+			  prefapi.cpp \
 			 $(NULL)
 
 PREF_JS_EXPORTS	= \

modules/libpref/src/nsPrefBranch.cpp

@@ -69,7 +69,7 @@ struct PrefCallbackData {
 static NS_DEFINE_CID(kSecurityManagerCID, NS_SCRIPTSECURITYMANAGER_CID);
 
 // Prototypes
-extern "C" PrefResult pref_UnlockPref(const char *key);
+extern PrefResult pref_UnlockPref(const char *key);
 PR_STATIC_CALLBACK(PRIntn) pref_enumChild(PLHashEntry *he, int i, void *arg);
 static int PR_CALLBACK NotifyObserver(const char *newpref, void *data);
 

modules/libpref/src/nsPrefService.cpp

@@ -780,7 +780,7 @@ extern "C" JSBool pref_InitInitialObjects()
 }
 
 
-extern "C" JSRuntime* PREF_GetJSRuntime()
+extern JSRuntime* PREF_GetJSRuntime()
 {
   nsresult rv;