Switch bfcache from android_debug_bot to android_debug_static_bot.

is_component_build=true causes short timeouts _within_ tests to be exceeded,
probably due to lazy loading of components.

Bug: 1016230
Change-Id: I7236b590d62255154fa52f86999894aa36a95441
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1870157Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Arthur Hemery <ahemery@chromium.org>
Commit-Queue: Fergal Daly <fergal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707773}

tools/mb/mb_config.pyl

@@ -84,7 +84,7 @@
       'Memory Infra Tester': 'android_release_thumb_bot',
       'android-marshmallow-x86-fyi-rel': 'android_release_bot_minimal_symbols_x86_resource_whitelisting',
       'android-pie-x86-fyi-rel': 'android_release_bot_minimal_symbols_x86',
-      'android-bfcache-debug': 'android_debug_bot',
+      'android-bfcache-debug': 'android_debug_static_bot',
     },
 
     'chromium.chromedriver': {