Bug 1273020 - add more assertions, r=njn

accessible/generic/ApplicationAccessible.cpp

@@ -27,6 +27,7 @@ ApplicationAccessible::ApplicationAccessible() :
 {
   mType = eApplicationType;
   mAppInfo = do_GetService("@mozilla.org/xre/app-info;1");
+  MOZ_ASSERT(mAppInfo, "no application info");
 }
 
 NS_IMPL_ISUPPORTS_INHERITED0(ApplicationAccessible, Accessible)

accessible/generic/ApplicationAccessible.h

@@ -60,6 +60,8 @@ public:
 
   void AppName(nsAString& aName) const
   {
+    MOZ_ASSERT(mAppInfo, "no application info");
+
     if (mAppInfo) {
       nsAutoCString cname;
       mAppInfo->GetName(cname);
@@ -69,6 +71,8 @@ public:
 
   void AppVersion(nsAString& aVersion) const
   {
+    MOZ_ASSERT(mAppInfo, "no application info");
+
     if (mAppInfo) {
       nsAutoCString cversion;
       mAppInfo->GetVersion(cversion);
@@ -83,6 +87,8 @@ public:
 
   void PlatformVersion(nsAString& aVersion) const
   {
+    MOZ_ASSERT(mAppInfo, "no application info");
+
     if (mAppInfo) {
       nsAutoCString cversion;
       mAppInfo->GetPlatformVersion(cversion);