Bug 1449587 - change the chunks that reftests run in to complete in more realistic runtimes and balance overhead + test time. r=ahal

taskcluster/ci/test/reftest.yml

@@ -110,8 +110,8 @@ reftest:
             android.*: 28
             macosx64.*/opt: 1
             macosx64.*/debug: 3
-            windows10-64.*/opt: 1
-            windows10-64.*/debug: 2
+            windows.*/opt: 2
+            windows.*/debug: 4
             default: 8
     e10s:
         by-test-platform:
@@ -138,7 +138,10 @@ reftest-gpu:
     description: "Reftest GPU run"
     suite: reftest/reftest-gpu
     treeherder-symbol: R(Rg)
-    chunks: 8
+    chunks:
+        by-test-platform:
+            windows.*/opt: 2
+            default: 4
     run-on-projects:
         by-test-platform:
             windows10.*: []
@@ -162,6 +165,7 @@ reftest-no-accel:
     chunks:
         by-test-platform:
             macosx.*: 1
+            windows.*: 4
             default: 8
     e10s:
         by-test-platform:

taskcluster/taskgraph/transforms/tests.py

@@ -766,15 +766,6 @@ def split_chunks(config, tests):
             yield test
             continue
 
-        # HACK: Bug 1373578 appears to pass with more chunks, non-e10s only though
-        if test['test-platform'] == 'windows7-32/debug' and test['test-name'] == 'reftest':
-            test['chunks'] = 32
-
-        if (test['test-platform'] == 'windows7-32/opt' or
-            test['test-platform'] == 'windows7-32-pgo/opt') and \
-                test['test-name'] in ['reftest-e10s', 'reftest-no-accel-e10s', 'reftest-gpu-e10s']:
-            test['chunks'] = 32
-
         for this_chunk in range(1, test['chunks'] + 1):
             # copy the test and update with the chunk number
             chunked = copy.deepcopy(test)