diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
index b43a3afb67..44c276c80d 100644
--- a/build/config/BUILDCONFIG.gn
+++ b/build/config/BUILDCONFIG.gn
@@ -543,11 +543,7 @@ if (custom_toolchain != "") {
   import("//build/config/ios/ios_sdk.gni")  # For use_ios_simulator
   host_toolchain = "//build/toolchain/mac:clang_$host_cpu"
   if (use_ios_simulator) {
-    if (target_cpu == "arm" || target_cpu == "arm64") {
-      set_default_toolchain("//build/toolchain/mac:ios_clang_arm_sim")
-    } else {
-      set_default_toolchain("//build/toolchain/mac:ios_clang_x64_sim")
-    }
+    set_default_toolchain("//build/toolchain/mac:ios_clang_x64")
   } else {
     set_default_toolchain("//build/toolchain/mac:ios_clang_arm")
   }
diff --git a/build/toolchain/clang.gni b/build/toolchain/clang.gni
index 097b4ff384..021b141698 100644
--- a/build/toolchain/clang.gni
+++ b/build/toolchain/clang.gni
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/config/ios/ios_sdk.gni") # For use_ios_simulator
-
 declare_args() {
   # Enable the optional type profiler in Clang, which will tag heap allocations
   # with the allocation type.
@@ -28,7 +26,5 @@ declare_args() {
   # TODO(dnfield): We shouldn't need Xcode for bitcode_marker builds, but we do
   # until libpng and dart have explicitly added LLVM asm sections to their
   # assembly sources. https://github.com/flutter/flutter/issues/39281
-  # TODO(gw280): Once our own copy of clang 12 is capable of building for arm64 simulator,
-  # we can safely remove the requirement that we use xcode for arm64 simulator builds.
-  use_xcode = enable_bitcode || (use_ios_simulator && (target_cpu == "arm" || target_cpu == "arm64"))
+  use_xcode = enable_bitcode
 }
diff --git a/build/toolchain/mac/BUILD.gn b/build/toolchain/mac/BUILD.gn
index 742adcb71f..6b898234aa 100644
--- a/build/toolchain/mac/BUILD.gn
+++ b/build/toolchain/mac/BUILD.gn
@@ -250,29 +250,8 @@ mac_toolchain("ios_clang_arm") {
   sysroot_flags = "-isysroot $ios_device_sdk_path -miphoneos-version-min=$ios_deployment_target"
 }
 
-# Toolchain used for iOS simulator targets (arm64).
-mac_toolchain("ios_clang_arm_sim") {
-  toolchain_cpu = "arm"
-  toolchain_os = "mac"
-  if (!use_xcode) {
-    prefix = rebase_path(llvm_bin_path, root_build_dir)
-    ar = "$prefix/llvm-ar"
-    cc = "$prefix/clang"
-    cxx = "$prefix/clang++"
-  } else {
-    # TODO: https://github.com/harfbuzz/harfbuzz/issues/2834
-    # harfbuzz has a non-fatal warning right now with Xcode 12
-    ar = "ar"
-    cc = "clang"
-    cxx = "clang++"
-  }
-  ld = cxx
-  is_clang = true
-  sysroot_flags = "-isysroot $ios_simulator_sdk_path -mios-simulator-version-min=$ios_deployment_target"
-}
-
-# Toolchain used for iOS simulator targets (x64).
-mac_toolchain("ios_clang_x64_sim") {
+# Toolchain used for iOS simulator targets.
+mac_toolchain("ios_clang_x64") {
   toolchain_cpu = "x64"
   toolchain_os = "mac"
   prefix = rebase_path(llvm_bin_path, root_build_dir)