[cronet] Switch android_cronet_tester to static_library.

tools/mb/mb_config.pyl

Index: tools/mb/mb_config.pyl
diff --git a/tools/mb/mb_config.pyl b/tools/mb/mb_config.pyl
index 6417815df8c8417116cd7791f43746c636993720..31f1c76ea45fff29f9c642535bd13649563c28bb 100644
--- a/tools/mb/mb_config.pyl
+++ b/tools/mb/mb_config.pyl
@@ -652,7 +652,9 @@
       'android_compile_rel': 'swarming_android_gyp_release_trybot',
       'android_compile_x64_dbg': 'android_gn_debug_trybot_x64',
       'android_compile_x86_dbg': 'android_gn_debug_trybot_x86',
-      'android_cronet_tester': 'android_cronet_gyp_debug_trybot',
+      # TODO(crbug/597596): Switch this back to debug_trybot when cronet's
+      # shared library loading is fixed.
+      'android_cronet_tester': 'android_cronet_gyp_debug_static_bot',
       'linux_android_dbg_ng': 'swarming_android_gyp_debug_trybot',
       'linux_android_rel_ng': 'swarming_android_gyp_release_trybot',
     },
@@ -871,10 +873,6 @@
       'android', 'cronet', 'gyp', 'debug_static_bot', 'x86'
     ],
 
-    'android_cronet_gyp_debug_trybot': [
-      'android', 'cronet', 'gyp', 'debug_trybot'
-    ],
-
     'android_cronet_gyp_release_bot_minimal_symbols': [
       'android', 'cronet', 'gyp', 'release_bot_minimal_symbols', 'arm'
     ],