WebRTC+libyuv: switch to use_allocator GYP variable.

masters/master.tryserver.webrtc/master.cfg

Index: masters/master.tryserver.webrtc/master.cfg
diff --git a/masters/master.tryserver.webrtc/master.cfg b/masters/master.tryserver.webrtc/master.cfg
index 8a0eb72251cd4800c1b909e31da3c632c1288381..a0af609b7d07a8ba2422f6997a58423279e95e54 100755
--- a/masters/master.tryserver.webrtc/master.cfg
+++ b/masters/master.tryserver.webrtc/master.cfg
@@ -90,7 +90,6 @@ baremetal_linux_tests = baremetal_common_tests + [
     'libjingle_peerconnection_java_unittest',
 ]
 
-asan_gyp_defines = 'asan=1 release_extra_cflags=-g linux_use_tcmalloc=0'
 options = ['--clobber-post-fail', '--compiler=goma']
 clang_options = ['--clobber-post-fail', '--compiler=goma-clang']
 win_factory_prop = {
@@ -231,8 +230,7 @@ b_mac_asan = {
         tests=tests,
         factory_properties={
             'asan': True,
-            'gclient_env': {'GYP_DEFINES': asan_gyp_defines,
-                            'GYP_GENERATORS': 'ninja'},
+            'gclient_env': {'GYP_DEFINES': 'asan=1 release_extra_cflags=-g'},
         }),
 }
 
@@ -320,7 +318,9 @@ b_linux_asan = {
             'asan': True,
             'sharded_tests': tests,
             'force_isolated': True,
-            'gclient_env': {'GYP_DEFINES': asan_gyp_defines},
+            'gclient_env': {'GYP_DEFINES': ('asan=1 release_extra_cflags=-g '
+                                            'use_allocator=none'),
+            },
         }),
 }