Make SyzyAsan depend on 'syzyasan' GYP flag instead of 'asan==1 and OS=="win"'

chrome/chrome_syzygy.gyp

Index: chrome/chrome_syzygy.gyp
diff --git a/chrome/chrome_syzygy.gyp b/chrome/chrome_syzygy.gyp
index ea73fa5ef21c7ffec500f1896bcd39eabf9d7135..c2c81a1588dc211a72a6d858cc9c1aeb173eb360 100644
--- a/chrome/chrome_syzygy.gyp
+++ b/chrome/chrome_syzygy.gyp
@@ -3,7 +3,7 @@
 # found in the LICENSE file.
 {
   'conditions': [
-    ['OS=="win" and asan==1', {
+    ['syzyasan==1', {
       'variables': {
         'dest_dir': '<(PRODUCT_DIR)/syzygy',
         'syzygy_exe_dir': '<(DEPTH)/third_party/syzygy/binaries/exe',
@@ -48,7 +48,7 @@
     }],
     # Note, not else.
     ['OS=="win" and fastbuild==0 and chrome_multiple_dll==1 and '
-        '(asan!=1 or buildtype!="Official")', {
+        '(syzyasan!=1 or buildtype!="Official")', {
       'variables': {
         'dll_name': 'chrome_child',
       },
@@ -65,7 +65,7 @@
     }, {
       'conditions': [
         ['OS=="win" and fastbuild==0 and chrome_multiple_dll==1 and '
-            'asan==1 and buildtype=="Official"', {
+            'syzyasan==1 and buildtype=="Official"', {
           'targets': [
           {
             'target_name': 'chrome_child_dll_syzygy',