Use the basic URL parser when parsing URLs

Blob handling is not required, since the resulting URL is not stored in
any way that would make the blob handling visible. This is consistent
with what the URL constructor and similar uses do.

This change should not be observable.

Partially addresses #242.

spec.bs

@@ -513,10 +513,10 @@ A <dfn>component</dfn> is a [=struct=] with the following [=struct/items=]:
     1. If |input| is a {{USVString}}:
       1. Let |baseURL| be null.
       1. If |baseURLString| was given, then:
-        1. Set |baseURL| to the result of [=URL parser|parsing=] |baseURLString|.
+        1. Set |baseURL| to the result of [=basic URL parser|parsing=] |baseURLString|.
         1. If |baseURL| is failure, return null.
         1. [=list/Append=] |baseURLString| to |inputs|.
-      1. Set |url| to the result of [=URL parser|parsing=] |input| given |baseURL|.
+      1. Set |url| to the result of [=basic URL parser|parsing=] |input| given |baseURL|.
       1. If |url| is failure, return null.
     1. [=Assert=]: |url| is a [=/URL=].
     1. Set |protocol| to |url|'s [=url/scheme=].
@@ -1852,7 +1852,7 @@ To <dfn>convert a modifier to a string</dfn> given a [=part/modifier=] |modifier
 
       Username and password are also never inherited from a base URL when constructing a {{URLPattern}}. (They are, however, inherited from the base URL when parsing a URL supplied as an argument to {{URLPattern/test()}} or {{URLPattern/exec()}}.)
     </div>
-    1. Set |baseURL| to the result of [=URL parser|parsing=] |init|["{{URLPatternInit/baseURL}}"].
+    1. Set |baseURL| to the result of [=basic URL parser|parsing=] |init|["{{URLPatternInit/baseURL}}"].
     1. If |baseURL| is failure, then throw a {{TypeError}}.
     1. If |init|["{{URLPatternInit/protocol}}"] does not [=map/exist=], then set |result|["{{URLPatternInit/protocol}}"] to the result of [=processing a base URL string=] given |baseURL|'s [=url/scheme=] and |type|.
     1. If |type| is not "`pattern`" and |init| [=map/contains=] none of "{{URLPatternInit/protocol}}", "{{URLPatternInit/hostname}}", "{{URLPatternInit/port}}" and "{{URLPatternInit/username}}", then set |result|["{{URLPatternInit/username}}"] to the result of [=processing a base URL string=] given |baseURL|'s [=url/username=] and |type|.