Revert of Simplify landmines code a bit now that all branches of all platforms are on ninja

build/get_landmines.py

Index: build/get_landmines.py
diff --git a/build/get_landmines.py b/build/get_landmines.py
index 613f2d1facc9a94a40d50bb7573be2e2ab72837d..395c18f4fd71fe4e86526cdad459f9752494cef1 100755
--- a/build/get_landmines.py
+++ b/build/get_landmines.py
@@ -30,26 +30,27 @@
   # dependency problems, fix the dependency problems instead of adding a
   # landmine.
 
-  if distributor() == 'goma' and platform() == 'win32':
+  if (distributor() == 'goma' and platform() == 'win32' and
+      builder() == 'ninja'):
     print 'Need to clobber winja goma due to backend cwd cache fix.'
   if platform() == 'android':
     print 'Clobber: to handle new way of suppressing findbugs failures.'
     print 'Clobber to fix gyp not rename package name (crbug.com/457038)'
-  if platform() == 'win':
+  if platform() == 'win' and builder() == 'ninja':
     print 'Compile on cc_unittests fails due to symbols removed in r185063.'
-  if platform() == 'linux':
+  if platform() == 'linux' and builder() == 'ninja':
     print 'Builders switching from make to ninja will clobber on this.'
   if platform() == 'mac':
     print 'Switching from bundle to unbundled dylib (issue 14743002).'
   if platform() in ('win', 'mac'):
     print ('Improper dependency for create_nmf.py broke in r240802, '
            'fixed in r240860.')
-  if (platform() == 'win' and
+  if (platform() == 'win' and builder() == 'ninja' and
       gyp_msvs_version() == '2012' and
       gyp_defines().get('target_arch') == 'x64' and
       gyp_defines().get('dcheck_always_on') == '1'):
     print "Switched win x64 trybots from VS2010 to VS2012."
-  if (platform() == 'win' and
+  if (platform() == 'win' and builder() == 'ninja' and
       gyp_msvs_version().startswith('2013')):
     print "Switch to VS2013"
   if (platform() == 'win' and gyp_msvs_version().startswith('2015')):