Remove blink_asserts_always_on gyp variable.

dcheck_always_on=1 has the same effect now.

BUG=411008

Review URL: https://codereview.chromium.org/556683003

git-svn-id: svn://svn.chromium.org/blink/trunk@181687 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/build/features.gypi

@@ -44,7 +44,6 @@
       'enable_oilpan%': 0,
       'gc_profile_heap%': 0,
       'gc_profile_marking%': 0,
-      'blink_asserts_always_on%': 0,
       'blink_logging_always_on%': 0,
     },
     'conditions': [
@@ -100,11 +99,6 @@
           'ENABLE_GC_PROFILE_MARKING=1',
         ],
       }],
-      ['blink_asserts_always_on==1', {
-        'feature_defines': [
-          'ENABLE_ASSERT=1',
-        ],
-      }],
       ['blink_logging_always_on==1', {
         'feature_defines': [
           'LOG_DISABLED=0',