Delete chrome_modern_public_bundle target

Now that Marshmallow has been deprecated, there is no need to maintain
this target. Local dev should use chrome_public_apk, and if bundles are
needed, then monochrome_public_bundle should be used.

Bug: 1366416
Change-Id: I8a0da23b73247b1361db067051776c6401aa2500
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4226046
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1102800}
diff --git a/docs/android_build_instructions.md b/docs/android_build_instructions.md
index b6568cf..9f71751 100644
--- a/docs/android_build_instructions.md
+++ b/docs/android_build_instructions.md
@@ -183,21 +183,18 @@
 depending on the version of Android running on a device. Chrome uses this
 feature to package optimized versions for different OS versions.
 
-1. `chrome_modern_public_bundle` (ChromeModernPublic.aab)
-   * `minSdkVersion=24` (Nougat).
-   * WebView packaged independently (`system_webview_bundle`).
-2. `monochrome_public_bundle` (MonochromePublic.aab)
+1. `monochrome_public_bundle` (MonochromePublic.aab)
    * `minSdkVersion=24` (Nougat).
    * Contains both Chrome and WebView (to save disk space).
-3. `trichrome_chrome_bundle` (TrichromeChrome.aab)
+2. `trichrome_chrome_bundle` (TrichromeChrome.aab)
    * `minSdkVersion=29` (Android 10).
    * Native code shared with WebView through a "Static Shared Library APK": `trichrome_library_apk` 
    * Corresponding WebView target: `trichrome_webview_bundle`
-4. `chrome_public_apk` (ChromePublic.apk)
+3. `chrome_public_apk` (ChromePublic.apk)
+   * `minSdkVersion=24` (Nougat).
+   * WebView packaged independently (`system_webview_apk`).
    * Used for only local development and tests (simpler than using bundle
      targets).
-   * Same configuration as chrome_modern_public_bundle, except without
-     separating things into modules.
 
 *** note
 **Notes:**