Remove hard-coded sdk build tools path from test_runner_py target.

BUG=688263

Review-Url: https://codereview.chromium.org/2752093003
Cr-Commit-Position: refs/heads/master@{#457534}

build/android/BUILD.gn

@@ -114,11 +114,11 @@ group("test_runner_py") {
            "devil_chromium.json",
            "pylib/gtest/filter/",
            "test_wrapper/logdog_wrapper.py",
-           "//third_party/android_tools/sdk/build-tools/24.0.2/aapt",
-           "//third_party/android_tools/sdk/build-tools/24.0.2/dexdump",
-           "//third_party/android_tools/sdk/build-tools/24.0.2/lib64/libc++.so",
-           "//third_party/android_tools/sdk/build-tools/24.0.2/split-select",
-           "//third_party/android_tools/sdk/platform-tools/adb",
+           "${android_sdk_build_tools}/aapt",
+           "${android_sdk_build_tools}/dexdump",
+           "${android_sdk_build_tools}/lib64/libc++.so",
+           "${android_sdk_build_tools}/split-select",
+           "${android_sdk_root}/platform-tools/adb",
            "//third_party/catapult/third_party/gsutil/",
            "//third_party/catapult/devil/devil/devil_dependencies.json",
            "//third_party/proguard/lib/proguard.jar",