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This reverts commit 1b21e379.

Reason for revert: prereq for reverting #748056, 
https://crbug.com/1059666

Original change's description:
> Migrate URL and Origin typemaps to GN definitions
> 
> Also moves some longer bits of code out-of-line.
> 
> Bug: 1059389
> Change-Id: Idd1b3606e26504ab92e9aefebc933823919a2431
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2092695
> Commit-Queue: Ken Rockot <rockot@google.com>
> Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#748058}

TBR=dcheng@chromium.org,rockot@google.com,dtapuska@chromium.org

Change-Id: I2573e9bea2f125e5dafe7a1d9b9b46ac1d12025a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1059389
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095216Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748193}