Fix mb config for jumbo builders

TBR=dpranke

Bug: 782863
Change-Id: I58d9133edb8ef51ab5cd3c6cf9fdb8684cc007b5
Reviewed-on: https://chromium-review.googlesource.com/1016172Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551585}

tools/mb/mb_config.pyl

@@ -333,7 +333,7 @@
       'Cast Android (dbg)': 'android_cast_debug_static_bot',
       'Cast Linux': 'cast_release_bot',
       'Cast Audio Linux': 'cast_audio_release_bot',
-      'linux64-jumbo-rel': 'jumbo_release_bot_minimal_symbols',
+      'linux-jumbo-rel': 'jumbo_release_bot_minimal_symbols',
       'Leak Detection Linux': 'release_bot',
       'Linux Builder (dbg)': 'debug_bot',
       'Linux Builder (dbg)(32)': 'debug_bot_x86',
@@ -500,7 +500,7 @@
       # Windows bots take too long to link w/ full symbols and time out.
       'Win Builder': 'release_bot_x86_minimal_symbols',
       'Win Builder (dbg)': 'debug_bot_x86_minimal_symbols',
-      'win64-jumbo-rel': 'jumbo_release_bot_minimal_symbols',
+      'win-jumbo-rel': 'jumbo_release_bot_minimal_symbols',
       'Win x64 Builder': 'release_bot_minimal_symbols',
       'Win x64 Builder (dbg)': 'debug_bot_minimal_symbols',
     },