V8: Get build environment from MB

scripts/slave/recipes/v8.expected/full_client_v8_ports_V8_Linux___x87___nosnap___debug_builder.json

Index: scripts/slave/recipes/v8.expected/full_client_v8_ports_V8_Linux___x87___nosnap___debug_builder.json
diff --git a/scripts/slave/recipes/v8.expected/full_client_v8_ports_V8_Linux___x87___nosnap___debug_builder.json b/scripts/slave/recipes/v8.expected/full_client_v8_ports_V8_Linux___x87___nosnap___debug_builder.json
index bd7ca9e06fa587e27c599ac1e0f009410ff558b2..d79b93fade314f04fab3499ce6655dcb0d4e5101 100644
--- a/scripts/slave/recipes/v8.expected/full_client_v8_ports_V8_Linux___x87___nosnap___debug_builder.json
+++ b/scripts/slave/recipes/v8.expected/full_client_v8_ports_V8_Linux___x87___nosnap___debug_builder.json
@@ -374,8 +374,7 @@
         "builder_name": "V8 Linux - x87 - nosnap - debug",
         "properties": {
           "parent_build_environment": {
-            "GYP_DEFINES": "target_arch=ia32 test_isolation_mode=prepare use_goma=1 v8_enable_slow_dchecks=1 v8_optimized_debug=1 v8_target_arch=x87 v8_use_snapshot=false",
-            "GYP_GENERATORS": "ninja"
+            "GYP_DEFINES": "target_arch=x64 cool_flag=a=1"
           },
           "parent_got_revision": "f2cbea7e89a45f46819777bb78a1f5bd0241f64c",
           "parent_got_revision_cp": "refs/heads/master@{#50110}",