[cookies] return loaded cookies as list

don't set_cookie() them immediately into a CookieJar
also, give some more consistent names to chrome/chromium functions

gallery_dl/util.py

@@ -403,9 +403,9 @@ def set_mtime(path, mtime):
         pass
 
 
-def cookiestxt_load(fp, cookiejar):
-    """Parse a Netscape cookies.txt file and add its Cookies to 'cookiejar'"""
-    set_cookie = cookiejar.set_cookie
+def cookiestxt_load(fp):
+    """Parse a Netscape cookies.txt file and add return its Cookies"""
+    cookies = []
 
     for line in fp:
 
@@ -427,7 +427,7 @@ def cookiestxt_load(fp, cookiejar):
             name = value
             value = None
 
-        set_cookie(Cookie(
+        cookies.append(Cookie(
             0, name, value,
             None, False,
             domain,
@@ -439,6 +439,8 @@ def cookiestxt_load(fp, cookiejar):
             False, None, None, {},
         ))
 
+    return cookies
+
 
 def cookiestxt_store(fp, cookies):
     """Write 'cookies' in Netscape cookies.txt format to 'fp'"""