WebView: remove outdated docs for test shell

docs/android_build_instructions.md

 # Checking out and building Chromium for Android
 
 There are instructions for other platforms linked from the
 [get the code](get_the_code.md) page.
 
 ## Instructions for Google Employees
 
 Are you a Google employee? See
 [go/building-chrome](https://goto.google.com/building-chrome) instead.
 
@@ skipping 206 matching lines @@
 `out/Release/apks/ContentShell.apk`. (Where `Release` is the name of your build
 directory.)
 
 If you use custom out dir instead of standard out/ dir, use
 CHROMIUM_OUT_DIR env.
 
 ```shell
 export CHROMIUM_OUT_DIR=out_android
 ```
 
-### Build WebView shell
+### Build WebView
 
 [Android WebView](https://developer.android.com/reference/android/webkit/WebView.html)
 is a system framework component. Since Android KitKat, it is implemented using
 Chromium code (based off the [content module](https://dev.chromium.org/developers/content-module)).
-It is possible to test modifications to WebView using a simple test shell. The
-WebView shell is a view with a URL bar at the top (see [code](https://code.google.com/p/chromium/codesearch#chromium/src/android_webview/test/shell/src/org/chromium/android_webview/test/AwTestContainerView.java))
-and is **independent** of the WebView **implementation in the Android system** (
-the WebView shell is essentially a standalone unbundled app).
-As drawback, the shell runs in non-production rendering mode only.
 
-```shell
-ninja -C out/Release android_webview_apk
-build/android/adb_install_apk.py out/Release/apks/AndroidWebView.apk
-```
-
-If, instead, you want to build the complete Android WebView framework component and test the effect of your chromium changes in other Android app using the WebView, you should follow the [Android AOSP + chromium WebView instructions](https://www.chromium.org/developers/how-tos/build-instructions-android-webview)
+If you want to build the complete Android WebView framework component and test
+the effect of your chromium changes in Android apps using WebView, you should
+follow the [Android AOSP + chromium WebView
+instructions](https://www.chromium.org/developers/how-tos/build-instructions-android-webview)
 
 ### Running
 
 Set [command line flags](https://www.chromium.org/developers/how-tos/run-chromium-with-flags) if necessary.
 
 For Content shell:
 
 ```shell
 build/android/adb_run_content_shell  http://example.com
 ```
 
 For Chrome public:
 
 ```shell
 build/android/adb_run_chrome_public  http://example.com
 ```
 
-For Android WebView shell:
-
-```shell
-build/android/adb_run_android_webview_shell http://example.com
-```
-
 ### Logging and debugging
 
 Logging is often the easiest way to understand code flow. In C++ you can print
 log statements using the LOG macro or printf(). In Java, you can print log
 statements using [android.util.Log](https://developer.android.com/reference/android/util/Log.html):
 
 `Log.d("sometag", "Reticulating splines progress = " + progress);`
 
 You can see these log statements using adb logcat:
 
 ```shell
 adb logcat...01-14 11:08:53.373 22693 23070 D sometag: Reticulating splines progress = 0.99
 ```
 
 You can debug Java or C++ code. To debug C++ code, use one of the
 following commands:
 
 ```shell
 build/android/adb_gdb_content_shell
 build/android/adb_gdb_chrome_public
-build/android/adb_gdb_android_webview_shell http://example.com
 ```
 
 See [Debugging Chromium on Android](https://www.chromium.org/developers/how-tos/debugging-on-android)
 for more on debugging, including how to debug Java code.
 
 ### Testing
 
 For information on running tests, see [android\_test\_instructions.md](https://chromium.googlesource.com/chromium/src/+/master/docs/android_test_instructions.md).
 
 ### Faster Edit/Deploy (GN only)
@@ skipping 65 matching lines @@
 release of Chrome for Android (v25+) you can do the following steps.
 Note that in order to get your changes into the official release, you'll
 need to send your change for a codereview using the regular process for
 committing code to chromium.
 
 1.  Open Chrome on your Android device and visit chrome://version
 2.  Copy down the id listed next to "Build ID:"
 3.  Go to
     [http://storage.googleapis.com/chrome-browser-components/BUILD\_ID\_FROM\_STEP\_2/index.html](http://storage.googleapis.com/chrome-browser-components/BUILD_ID_FROM_STEP_2/index.html)
 4.  Download the listed files and follow the steps in the README.