Revert "Allow build ChromeDriver during Android build"

This reverts commit 1cd142b4.

Reason for revert: Causing build failures on Android x86 Builder (dbg)

Original change's description:
> Allow build ChromeDriver during Android build
> 
> While build for android, ChromeDriver can be built using host toolchain.
> 
> Bug: 1050709
> Change-Id: Ifc7b97f4474e73e3025ec33450bdfd29559ba087
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050872
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Commit-Queue: John Chen <johnchen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#741146}

TBR=johnchen@chromium.org,jbudorick@chromium.org

Change-Id: I343851d232030913b08730c478f07dbeb6657792
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1050709, 1052318
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2057109Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741457}

BUILD.gn

@@ -496,7 +496,6 @@ group("gn_all") {
       "//base:build_utf8_validator_tables",
       "//base:check_example",
       "//cc:cc_perftests",
-      "//chrome/test/chromedriver:chromedriver($host_toolchain)",
       "//components:components_perftests",
       "//device:device_unittests",
       "//gin:gin_shell",
@@ -515,6 +514,7 @@ group("gn_all") {
       deps += [
         "//chrome/test:load_library_perf_tests",
         "//chrome/test:sync_performance_tests",
+        "//chrome/test/chromedriver:chromedriver",
         "//courgette:courgette",
         "//courgette:courgette_fuzz",
         "//courgette:courgette_minimal_tool",