Remove references to tryserver.chromium.gpu

R=jam@chromium.org
BUG=426897

Review URL: https://codereview.chromium.org/960773002

Cr-Commit-Position: refs/heads/master@{#318203}

PRESUBMIT.py

@@ -1698,9 +1698,7 @@ def GetTryServerMasterForBot(bot):
   }
   master = master_map.get(bot)
   if not master:
-    if 'gpu' in bot:
-      master = 'tryserver.chromium.gpu'
-    elif 'linux' in bot or 'android' in bot or 'presubmit' in bot:
+    if 'linux' in bot or 'android' in bot or 'presubmit' in bot:
       master = 'tryserver.chromium.linux'
     elif 'win' in bot:
       master = 'tryserver.chromium.win'

gpu/tools/check_gpu_bots.py

@@ -134,9 +134,7 @@ class Waterfall:
   SPECIFIC_BUILD_URL = BASE_URL + '%s/builders/%s/builds/%s'
   BASE_JSON_BUILDERS_URL = BASE_URL + '%s/json/builders'
   BASE_JSON_BUILDS_URL = BASE_URL + '%s/json/builders/%s/builds'
-  REGULAR_WATERFALLS = ['chromium.gpu',
-          'tryserver.chromium.gpu',
-          'chromium.gpu.fyi']
+  REGULAR_WATERFALLS = ['chromium.gpu', 'chromium.gpu.fyi']
   WEBKIT_GPU_BOTS = ['GPU Win Builder',
           'GPU Win Builder (dbg)',
           'GPU Win7 (NVIDIA)',