[Android] Don't pass adb path to sharded perf tests.

infra/recipes/android/perf.expected/test_failure.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}, {'custom_deps': {'src/chrome/test/data/firefox2_profile/searchplugins': None, 'src/chrome/test/data/firefox2_searchplugins': None, 'src/chrome/test/data/firefox3_profile/searchplugins': None, 'src/chrome/test/data/firefox3_searchplugins': None, 'src/chrome/test/data/osdd': None, 'src/chrome/test/data/perf/frame_rate/private': None, 'src/chrome/test/data/plugin': None, 'src/chrome/test/data/ssl/certs': None, 'src/data/autodiscovery': None, 'src/data/esctf': None, 'src/data/mach_ports': None, 'src/data/memory_test': None, 'src/data/mozilla_js_tests': None, 'src/data/selenium_core': None, 'src/data/tab_switching': None, 'src/tools/grit/grit/test/data': None, 'src/webkit/data/bmp_decoder': None, 'src/webkit/data/ico_decoder': None, 'src/webkit/data/test_shell/plugins': None, 'src/webkit/data/xbm_decoder': None}, 'deps_file': '.DEPS.git', 'managed': False, 'name': 'src-internal', 'url': 'https://chrome-internal.googlesource.com/chrome/src-internal.git'}]\ntarget_os = ['android']",
       "--patch_root",
       "src",
@@ skipping 542 matching lines @@
       "--verbose",
       "--steps",
       "{\"steps\": {\"blink_perf.all.exact\": {\"cmd\": \"/usr/bin/python /path/to/run_benchmark --a=1 -v --b=2\", \"device_affinity\": 1, \"perf_dashboard_id\": \"blink_perf.all\"}, \"blink_perf.all.release\": {\"cmd\": \"/usr/bin/python /path/to/run_benchmark --a=1 -v --b=2\", \"device_affinity\": 0, \"perf_dashboard_id\": \"blink_perf.all\"}, \"blink_perf.dom\": {\"cmd\": \"/path/to/run_benchmark -v --upload-results blink_perf.dom\", \"device_affinity\": 1, \"perf_dashboard_id\": \"blink_perf.dom\"}}, \"version\": 2}",
       "--blacklist-file",
       "[SLAVE_BUILD]/src/out/bad_devices.json",
       "--collect-chartjson-data",
       "--max-battery-temp",
       "350",
       "--known-devices-file",
       "[HOME]/.android/known_devices.json",
-      "--enable-platform-mode",
-      "--adb-path",
-      "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools/adb"
+      "--enable-platform-mode"
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "env": {
       "CHROMIUM_OUTPUT_DIR": "[SLAVE_BUILD]/src/out/Release",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
     "name": "Sharded Perf Tests"
   },
   {
@@ skipping 241 matching lines @@
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "sharded perf tests failed [StepFailure(\"Step('perf_test.foo') failed with return_code 1\",)]",
     "recipe_result": null,
     "status_code": 1
   }
 ]