Revert "[build] Switch windows default compilation to MSVS 2017"

This reverts commit a0d2ffb6.

Reason for revert: Breaks CI

Original change's description:
> [build] Switch windows default compilation to MSVS 2017
> 
> Bug: v8:6857
> Change-Id: Icab007681753c6f8143147ea8b2c1b06bf325d92
> Reviewed-on: https://chromium-review.googlesource.com/686900
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48196}

TBR=machenbach@chromium.org,brucedawson@chromium.org,sergiyb@chromium.org

Change-Id: I5c961c8c28c6213014cf61ad342984193a18498e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:6857
Reviewed-on: https://chromium-review.googlesource.com/690034Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48199}

gni/isolate.gni

@@ -178,7 +178,7 @@ template("v8_isolate_run") {
       if (is_win) {
         args += [
           "--config-variable",
-          "msvs_version=2017",
+          "msvs_version=2015",
         ]
       } else {
         args += [

gypfiles/win/msvs_dependencies.isolate

@@ -25,8 +25,8 @@
         ],
       },
     }],
-    # VS2015/2017 runtimes
-    ['OS=="win" and (msvs_version==2015 or msvs_version==2017) and component=="shared_library" and (CONFIGURATION_NAME=="Debug" or CONFIGURATION_NAME=="Debug_x64")', {
+    # VS2015 runtimes
+    ['OS=="win" and msvs_version==2015 and component=="shared_library" and (CONFIGURATION_NAME=="Debug" or CONFIGURATION_NAME=="Debug_x64")', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/msvcp140d.dll',
@@ -36,7 +36,7 @@
         ],
       },
     }],
-    ['OS=="win" and (msvs_version==2015 or msvs_version==2017) and component=="shared_library" and (CONFIGURATION_NAME=="Release" or CONFIGURATION_NAME=="Release_x64")', {
+    ['OS=="win" and msvs_version==2015 and component=="shared_library" and (CONFIGURATION_NAME=="Release" or CONFIGURATION_NAME=="Release_x64")', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/msvcp140.dll',
@@ -46,7 +46,7 @@
         ],
       },
     }],
-    ['OS=="win" and (msvs_version==2015 or msvs_version==2017) and component=="shared_library"', {
+    ['OS=="win" and msvs_version==2015 and component=="shared_library"', {
       # Windows 10 Universal C Runtime binaries.
       'variables': {
         'files': [

test/webkit/webkit.status

@@ -36,10 +36,6 @@
   # Irregexp interpreter overflows stack. We should just not crash.
   'fast/js/regexp-stack-overflow': [PASS, FAIL],
 }],  # ALWAYS
-['system == windows', {
-  # Exceeds call stack on windows after MSVS2017 switch.
-  'fast/js/excessive-comma-usage': [SKIP],
-}],  # system == windows
 ['mode == debug', {
   # Too slow in debug mode.
   'dfg-int-overflow-in-loop': [SKIP],

tools/mb/mb.py

@@ -781,7 +781,7 @@ class MetaBuildWrapper(object):
     # TODO(machenbach): Remove after GYP_MSVS_VERSION is removed on infra side.
     env = {}
     env.update(os.environ)
-    env['GYP_MSVS_VERSION'] = '2017'
+    env['GYP_MSVS_VERSION'] = '2015'
 
     ret, _, _ = self.Run(cmd, env=env)
     if ret: