Revert of Create symlink to adb in home dir right before device setup.

scripts/slave/recipes/android/perf.expected/provision_devices.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.perf",
       "--builder",
       "Android Nexus5 Perf (1)",
@@ skipping 172 matching lines @@
     "cmd": [
       "unzip",
       "-o",
       "[SLAVE_BUILD]/src/out/build_product.zip"
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "name": "unzip_build_product"
   },
   {
     "cmd": [
-      "python",
-      "-u",
-      "[SLAVE_BUILD]/src/build/symlink.py",
-      "-f",
-      "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools/adb",
-      "~/adb"
-    ],
-    "cwd": "[SLAVE_BUILD]",
-    "name": "create adb symlink"
-  },
-  {
-    "cmd": [
       "RECIPE_PACKAGE_REPO[build]/scripts/slave/daemonizer.py",
       "--",
       "[SLAVE_BUILD]/src/build/android/adb_logcat_monitor.py",
       "[SLAVE_BUILD]/src/out/logcat"
     ],
     "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "[SLAVE_BUILD]/src/third_party/android_tools/sdk/platform-tools:[SLAVE_BUILD]/src/build/android:%(PATH)s"
     },
     "name": "spawn_logcat_monitor"
@@ skipping 150 matching lines @@
       "step returned non-zero exit code: 1",
       "@@@STEP_EXCEPTION@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "Infra Failure: Step('provision_devices') returned 1",
     "status_code": 1
   }
 ]