Switch deqp windows bots to use clang.

deqp used to not build with clang, but nowadays it does.
We wanted to wait with the switch until we can pin clang on the deqp
bots to an older clang if necessary, but we already don't do that
on mac and linux, so this doesn't make things any worse, and it
removes one blocker for the msvc bot turndown and makes the deqp
bots run tests with the compiler that we use for building shipping
chromium.

Bug: 727437, 786460
Change-Id: I3bd76f7e2939e33b28262ca509259b37e8bbe582
Reviewed-on: https://chromium-review.googlesource.com/1012740Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550737}

tools/mb/mb_config.pyl

@@ -305,11 +305,11 @@
       'GPU FYI Mac dEQP Builder': 'deqp_release_trybot',
       'GPU FYI Win Builder': 'gpu_fyi_tests_release_trybot_x86',
       'GPU FYI Win Builder (dbg)': 'gpu_fyi_tests_debug_trybot_x86',
-      'GPU FYI Win dEQP Builder': 'deqp_release_no_clang_trybot_x86',
+      'GPU FYI Win dEQP Builder': 'deqp_release_trybot_x86',
       'GPU FYI Win Clang Builder (dbg)': 'gpu_fyi_tests_win_clang_debug_bot',
       'GPU FYI Win x64 Builder': 'gpu_fyi_tests_release_trybot',
       'GPU FYI Win x64 Builder (dbg)': 'gpu_fyi_tests_debug_trybot',
-      'GPU FYI Win x64 dEQP Builder': 'deqp_release_no_clang_trybot',
+      'GPU FYI Win x64 dEQP Builder': 'deqp_release_trybot',
       'Linux FYI GPU TSAN Release': 'gpu_fyi_tests_release_trybot_tsan',
       'Mac FYI GPU ASAN Release': 'gpu_fyi_tests_release_trybot_asan',
       'Optional Android Release (Nexus 5X)': 'gpu_tests_android_release_trybot_arm64',
@@ -590,11 +590,11 @@
       'mac_angle_rel_ng': 'gpu_fyi_tests_release_trybot',
       'win_angle_dbg_ng': 'gpu_fyi_tests_debug_trybot_x86',
       'win_angle_compile_dbg_ng': 'gpu_fyi_tests_debug_trybot_x86',
-      'win_angle_deqp_rel_ng': 'deqp_release_no_clang_trybot_x86',
+      'win_angle_deqp_rel_ng': 'deqp_release_trybot_x86',
       'win_angle_rel_ng': 'gpu_fyi_tests_release_trybot_x86',
       'win_angle_x64_dbg_ng': 'gpu_fyi_tests_debug_trybot',
       'win_angle_compile_x64_dbg_ng': 'gpu_fyi_tests_debug_trybot',
-      'win_angle_x64_deqp_rel_ng': 'deqp_release_no_clang_trybot',
+      'win_angle_x64_deqp_rel_ng': 'deqp_release_trybot',
       'win_angle_x64_rel_ng': 'gpu_fyi_tests_release_trybot',
       'win_angle_compile_x64_rel_ng': 'gpu_fyi_tests_release_trybot',
     },
@@ -1266,18 +1266,8 @@
       'angle_deqp_tests', 'android', 'release_trybot', 'arm64',
     ],
 
-    'deqp_release_no_clang_trybot': [
-      # TODO(thakis): Remove no_clang once https://crbug.com/727437 is fixed.
-      # Still need conditional entries in .gclient so that clang and compiler
-      # options can be pinned based on the presence of a GN flag.
-      'angle_deqp_tests', 'release_trybot', 'no_clang',
-    ],
-
-    'deqp_release_no_clang_trybot_x86': [
-      # TODO(thakis): Remove no_clang once https://crbug.com/727437 is fixed.
-      # Still need conditional entries in .gclient so that clang and compiler
-      # options can be pinned based on the presence of a GN flag.
-      'angle_deqp_tests', 'release_trybot', 'x86', 'no_clang',
+    'deqp_release_trybot_x86': [
+      'angle_deqp_tests', 'release_trybot', 'x86',
     ],
 
     'deqp_release_trybot': [