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Also fixes bug where web app would not be considered installed if
replacement_web_app_url did not match start_url specified in the web app's
manifest.


https://docs.google.com/document/d/18ILBOp7lPP9faAC7mF9hwBC40egzrnGS8GUSkAdG3Lk/edit

Bug: 1007860
Change-Id: I6e70d5ae4dda797b4760dad4b4876ff205873dd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847609
Commit-Queue: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712419}