Delete unused GN variables from chrome_common_shared_library.gni

Bug: None
Change-Id: I392ce0c3454b106b9aed64fb20fc4ed3ff35ad0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3787154
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Commit-Queue: Sam Maier <smaier@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1028257}

chrome/android/chrome_common_shared_library.gni

@@ -18,10 +18,6 @@ declare_args() {
   use_relr_relocations = false
 }
 
-# TODO(cjgrant): Remove these variables once downstream stops using them.
-bundle_library_suffix = ""
-apk_pak_asset_type = "_apk"
-
 # This template contains all common configuration for native shared libraries,
 # including libchrome, monochrome, standalone webview (also called monochrome),
 # and libchromefortest (used by chrome_public_test_apk).