Remove links to old build instructions.

docs/old_ios_build_instructions.md

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-# iOS Build Instructions
-
-**Generally, this page is obsolete and you should look at
-[the new page instead](ios_build_instructions.md).**
-
-**Note:** Upstreaming of iOS code is still a work in progress. In particular,
-note that **it is not currently possible to build an actual Chromium app.**
-Currently, the buildable binaries are ios\_web\_shell (a minimal wrapper around
-the web layer), and various unit tests.
-
-## Prerequisites
-
-*   A Mac running 10.11+.
-*   [Xcode] 8.0+.
-*   [depot\_tools].
-*   The current version of the JDK (required for the closure compiler).
-
-## Getting the source
-
-To checkout the source, use `fetch ios` command from [depot\_tools] in a new
-empty directory.
-
-```shell
-# You can use a different location for your checkout of Chromium on iOS
-# by updating this variable. All shell snippets will refer to it.
-CHROMIUM_IOS="$HOME/chromium_ios"
-mkdir "$CHROMIUM_IOS"
-cd "$CHROMIUM_IOS"
-fetch ios
-```
-
-## Setting up
-
-Chromium on iOS is built using the [Ninja](ninja_build.md) tool and
-the [Clang](clang.md) compiler. See both of those pages for further details on
-how to tune the build.
-
-Before you build, you may want to [install API keys](api-keys) so that
-Chrome-integrated Google services work. This step is optional if you aren't
-testing those features.
-
-### Quick setup
-
-To setup the repository for building Chromium on iOS code, it is recommended
-to use the `src/ios/build/tools/setup-gn.py` script that creates a Xcode
-workspace configured to build the different targets for device and simulator.
-
-```shell
-cd "$CHROMIUM_IOS/src"
-ios/build/tools/setup-gn.py
-open out/build/all.xcworkspace
-```
-
-You can customize the build by editing the file `$HOME/.setup-gn` (create it
-if it does not exists).  Look at `src/ios/build/tools/setup-gn.config` for
-available configuration options.
-
-From this point, you can either build from Xcode or from the command-line
-using `ninja`. The script `setup-gn.py` creates sub-directories named
-`out/${configuration}-${platform}`, so for a `Debug` build for simulator
-use:
-
-```shell
-ninja -C out/Debug-iphonesimulator gn_all
-```
-
-Note: you need to run `setup-gn.py` script every time one of the `BUILD.gn`
-file is updated (either by you or after rebasing). If you forget to run it,
-the list of targets and files in the Xcode solution may be stale.
-
-### Advanced setup
-
-You can run `gn` manually to configure the build yourself. In that case,
-refer to [mac build instructions] for help on how to do that.
-
-To build for iOS, you have to set `target_os` to `"ios"`. Please also note
-that `is_component_build` is not supported when building for iOS and must
-be set to `false`.
-
-## Running
-
-Any target that is built and runs on the bots (see [below](#Troubleshooting))
-should run successfully in a local build. As of the time of writing, this is
-only ios\_web\_shell and unit test targets—see the note at the top of this
-page. Check the bots periodically for updates; more targets (new components)
-will come on line over time.
-
-To run in the simulator from the command line, you can use `iossim`. For
-example, to run a debug build of ios\_web\_shell:
-
-```shell
-out/Debug-iphonesimulator/iossim out/Debug-iphonesimulator/ios_web_shell.app
-```
-
-## Troubleshooting
-
-If your build fails, check the iOS columns of [the Mac
-waterfall](http://build.chromium.org/p/chromium.mac/console) (the last two) to
-see if the bots are green. In general they should be, since failures on those
-bots will close the tree.
-
-[Xcode]: https://developer.apple.com/xcode
-[depot\_tools]: https://dev.chromium.org/developers/how-tos/depottools
-[Ninja]: ninja.md
-[Clang]: clang.md
-[api-keys]: https://sites.google.com/a/chromium.org/dev/developers/how-tos/api-keys
-[mac build instructions]: mac_build_instructions.md