Auto merge of #15354 - cynicaldevil:manual-redirect, r=jdm

Redirect document loads manually

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #14596 .

r? @jdm

I ran some tests at random from the `navigating-across-documents` folder, and they are passing.

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Cargo.lock

@@ -489,6 +489,7 @@ dependencies = [
  "gaol 0.0.1 (git+https://github.com/servo/gaol)",
  "gfx 0.0.1",
  "gfx_traits 0.0.1",
+ "hyper 0.10.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipc-channel 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.5.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "layout_traits 0.0.1",