Temporarily switch the compiler back to VS2013 on DrMemory bots.

masters/master.chromium.memory.fyi/master.cfg

Index: masters/master.chromium.memory.fyi/master.cfg
diff --git a/masters/master.chromium.memory.fyi/master.cfg b/masters/master.chromium.memory.fyi/master.cfg
index f141ea1ef80764bd0d395a44af5a0d04bef43fc0..d50dc904b41960ef5e8c28626b2c6d2f92fe5e38 100644
--- a/masters/master.chromium.memory.fyi/master.cfg
+++ b/masters/master.chromium.memory.fyi/master.cfg
@@ -328,10 +328,13 @@ f_chromium_rel_win_drmemory_builder = F_WIN_NINJA(
     # TODO(timurrrr): Might wanna remove chromium_builder_dbg_drmemory_win
     # entirely as ninja supports target lists similar to what we always had
     # on Linux.
+    # TODO(zhaoqin|bruening): Temporarily using VS2013 due to bugs in DrMemory.
+    # crbug.com/594808.
     options=['--build-tool=ninja', '--', 'chromium_builder_dbg_drmemory_win'],
     factory_properties={
       'gclient_env': {'GYP_DEFINES': ('build_for_tool=drmemory '
                                       'component=shared_library '),
+                      'GYP_MSVS_VERSION': '2013',
                       'GYP_GENERATORS': 'ninja'},
       'package_pdb_files': True,
       'trigger': 'chromium_win_drmemory',
@@ -525,12 +528,15 @@ f_chromium_rel_win_drmemory_64_builder = F_WIN_NINJA(
     target='Release_x64',
     # TODO(bruening): remove "_dbg" from this name in all.gyp as it is
     # not limited to just Debug.
+    # TODO(zhaoqin|bruening): Temporarily using VS2013 due to bugs in DrMemory.
+    # crbug.com/594808.
     options=['--build-tool=ninja', '--', 'chromium_builder_dbg_drmemory_win'],
     factory_properties={
       'gclient_env': {
         'GYP_DEFINES' : (
             'build_for_tool=drmemory component=shared_library '
             'target_arch=x64'),
+        'GYP_MSVS_VERSION': '2013',
         'GYP_GENERATORS': 'ninja',
       },
       'package_pdb_files': True,