Windows/Linux: Enable V8 deprecation warnings

cef.gypi

@@ -30,11 +30,5 @@
         'enable_themes': 0,
       }]
     ]
-  }, 'conditions': [
-    ['os_posix==1 and OS!="mac" and OS!="android"', {
-      'target_defaults': {
-        'cflags_cc': ['-Wno-deprecated-declarations'],
-      },
-    }]
-  ],
+  }
 }

libcef/renderer/v8_impl.cc

@@ -23,6 +23,12 @@ MSVC_POP_WARNING();
 #undef FROM_HERE
 #undef LOG
 
+// Enable deprecation warnings for MSVC. See http://crbug.com/585142.
+#if defined(OS_WIN)
+#pragma warning(push)
+#pragma warning(default:4996)
+#endif
+
 #include "libcef/renderer/v8_impl.h"
 
 #include "libcef/common/cef_switches.h"
@@ -2401,3 +2407,9 @@ bool CefV8StackFrameImpl::IsEval() {
 bool CefV8StackFrameImpl::IsConstructor() {
   return is_constructor_;
 }
+
+
+// Enable deprecation warnings for MSVC. See http://crbug.com/585142.
+#if defined(OS_WIN)
+#pragma warning(pop)
+#endif