Removed references to linux_gpu, which has been removed

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 64c34be90f99fdb832190adfb17cfc66a5adf592..c136ed5e6b42f75d992380e2f917c20fa994e1fc 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -1602,7 +1602,6 @@ def GetTryServerMasterForBot(bot):
   """
   # Potentially ambiguous bot names are listed explicitly.
   master_map = {
-      'linux_gpu': 'tryserver.chromium.gpu',
       'win_gpu': 'tryserver.chromium.gpu',
       'chromium_presubmit': 'tryserver.chromium.linux',
       'blink_presubmit': 'tryserver.chromium.linux',
@@ -1698,7 +1697,6 @@ def GetDefaultTryConfigs(bots=None):
       'linux_chromium_rel': ['defaulttests'],
       'linux_chromium_rel_ng': ['defaulttests'],

[Ken Russell (switch to Gerrit), 2014/12/12 18:45:40]

Question: will the default try jobs against linux_chromium_rel_ng run all of the
tests, or are they filtered somehow by the "standard_tests" list above?

[Sergiy Byelozyorov, 2014/12/22 14:55:05]

defaulttests is just a "dummy" value. Recipes do not use it.

       'linux_chromium_clang_dbg': ['defaulttests'],
-      'linux_gpu': ['defaulttests'],
       'linux_nacl_sdk_build': ['compile'],
       'mac_chromium_compile_dbg': ['defaulttests'],
       'mac_chromium_compile_dbg_ng': ['defaulttests'],
@@ -1794,7 +1792,6 @@ def GetPreferredTryMasters(project, change):
       'linux_chromium_gn_dbg',
       'linux_chromium_gn_rel',
       'linux_chromium_rel_ng',
-      'linux_gpu',
       'mac_chromium_compile_dbg_ng',
       'mac_chromium_rel_ng',
       'win_chromium_compile_dbg',