Bug 1374580 (part 3) - Remove ns{,C}Substring typedefs. r=froydnj.

All the instances are converted as follows.

- nsSubstring  --> nsAString
- nsCSubstring --> nsACString

netwerk/cache/nsDiskCacheDeviceSQL.cpp

@@ -1358,7 +1358,7 @@ nsOfflineCacheDevice::InitWithSqlite(mozIStorageService * ss)
 namespace {
 
 nsresult
-GetGroupForCache(const nsCSubstring &clientID, nsCString &group)
+GetGroupForCache(const nsACString& clientID, nsCString& group)
 {
   group.Assign(clientID);
   group.Truncate(group.FindChar('|'));
@@ -2791,8 +2791,8 @@ nsOfflineCacheDevice::CacheOpportunistically(nsIApplicationCache* cache,
 }
 
 nsresult
-nsOfflineCacheDevice::ActivateCache(const nsCSubstring &group,
-                                    const nsCSubstring &clientID)
+nsOfflineCacheDevice::ActivateCache(const nsACString& group,
+                                    const nsACString& clientID)
 {
   NS_ENSURE_TRUE(Initialized(), NS_ERROR_NOT_INITIALIZED);
 
@@ -2827,8 +2827,8 @@ nsOfflineCacheDevice::ActivateCache(const nsCSubstring &group,
 }
 
 bool
-nsOfflineCacheDevice::IsActiveCache(const nsCSubstring &group,
-                                    const nsCSubstring &clientID)
+nsOfflineCacheDevice::IsActiveCache(const nsACString& group,
+                                    const nsACString& clientID)
 {
   nsCString *active = nullptr;
   MutexAutoLock lock(mLock);