Disable deprecated V8 APIs when building

Except for Mac. On Mac, we need to wait for one additional V8 roll.

BUG=322505
TBR=dcarney@chromium.org

Review URL: https://codereview.chromium.org/98543005

git-svn-id: http://src.chromium.org/svn/trunk/src/build@238106 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -2007,6 +2007,10 @@
       'ANGLE_DX11',
     ],
     'conditions': [
+      # TODO(jochen): Enable this unconditionally.
+      ['OS!="mac"', {
+        'defines': ['V8_DEPRECATION_WARNINGS'],
+      }],
       ['(OS=="mac" or OS=="ios") and asan==1', {
         'dependencies': [
           '<(DEPTH)/build/mac/asan.gyp:asan_dynamic_runtime',