Disables allocator_shim on Windows memory builders.

This change disables allocator_shim on Windows memory builders because it causes a linker error with the latest ANGLE code as reported by Erik (*1). Allocator_shim is disabled on shared builds and it happens only on memory builders, which use static builds. (All the other Windows debug builders use shared builds.)

(*1) https://groups.google.com/a/chromium.org/group/chromium-dev/browse_thread/thread/4197e93c6f5814ef/330ea8d9d31141e1?lnk=gst&q=base%2Fallocator+#330ea8d9d31141e1

BUG=none
TEST=build unit_tests.exe on the "Windows Tests (tsan)" bot and the "Chromium Windows Builder (DrMemory)" bot.
Review URL: https://chromiumcodereview.appspot.com/10704178

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@146303 0039d316-1c4b-4281-b951-d872f2087c98

build/common.gypi

@@ -1184,6 +1184,7 @@
         'release_valgrind_build': 1,
         'werror': '',
         'component': 'static_library',
+        'win_use_allocator_shim': 0,
         'use_system_zlib': 0,
       }],
 
@@ -1193,6 +1194,8 @@
       ['build_for_tool=="drmemory"', {
         # DrMemory can't handle the debug CRT dll, so build static.
         'component': 'static_library',
+        # Allocator_shim causes a linker error when we use std::locale.
+        'win_use_allocator_shim': 0,
         # These runtime checks force initialization of stack vars which blocks
         # DrMemory's uninit detection.
         'win_debug_RuntimeChecks': '0',