Quota: Remove net::GetHostOrSpecFromURL() from chrome://quota-internals.

The quota system has extracted the host from an url::Origin using two
approaches:
1) Call url::Origin::host() directly.
2) Pass url::Origin::GetURL() into net::GetHostOrSpecFromURL().

We have converged on the first approach. This CL removes the last
instance of net::GetHostOrSpecFromURL().

Bug: 496482
Change-Id: I428928de86b18c7f0a2147870a97cebcf8c463ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298188
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788687}

chrome/browser/ui/webui/quota_internals/quota_internals_types.cc

@@ -73,7 +73,7 @@ PerOriginStorageInfo::PerOriginStorageInfo(const GURL& origin,
                                            blink::mojom::StorageType type)
     : origin_(origin),
       type_(type),
-      host_(net::GetHostOrSpecFromURL(origin)),
+      host_(origin.host()),
       in_use_(-1),
       used_count_(-1) {}