Remove non-existant mips bot from mb_config

R=bratell@opera.com, dpranke@chromium.org

Bug: 825979
Change-Id: Ifd49620c3fe98408d104e5874bd1204897f8baf3
Reviewed-on: https://chromium-review.googlesource.com/981181Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Aaron Gable <agable@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546195}

tools/mb/mb_config.pyl

@@ -552,7 +552,6 @@
       'android_cfi_rel_ng': 'android_cfi_full_cfi_diag_thin_lto_release_static_dcheck_always_on_goma',
       'android_clang_dbg_recipe': 'android_clang_asan_debug_trybot_compile_only',
       'android_compile_dbg': 'android_debug_trybot_compile_only',
-      'android_compile_mips_dbg': 'android_debug_trybot_compile_only_mipsel',
       'android_compile_x64_dbg': 'android_debug_trybot_compile_only_x64',
       'android_compile_x86_dbg': 'android_debug_trybot_compile_only_x86',
       'android_coverage': 'android_debug_trybot_java_coverage',
@@ -928,10 +927,6 @@
       'android', 'debug_trybot', 'compile_only', 'arm64',
     ],
 
-    'android_debug_trybot_compile_only_mipsel': [
-      'android', 'debug_trybot', 'compile_only', 'mipsel',
-    ],
-
     'android_debug_trybot_compile_only_x64': [
       'android', 'debug_trybot', 'compile_only', 'x64',
     ],