Temporarily define RTC_DISALLOW_ASSIGN in Chromium constructormagic override.

The override will be removed shortly in https://codereview.webrtc.org/1342543004/ This is to make the FYI bots happy meanwhile.

BUG=chromium:468375
TBR=tommi@webrtc.org
NOTRY=true

Review URL: https://codereview.webrtc.org/1345193002

Cr-Commit-Position: refs/heads/master@{#9951}
diff --git a/webrtc/overrides/webrtc/base/constructormagic.h b/webrtc/overrides/webrtc/base/constructormagic.h
index 91e2748..f71fe82 100644
--- a/webrtc/overrides/webrtc/base/constructormagic.h
+++ b/webrtc/overrides/webrtc/base/constructormagic.h
@@ -17,4 +17,13 @@
 
 #include "base/macros.h"
 
+#define RTC_DISALLOW_ASSIGN(TypeName) \
+  DISALLOW_ASSIGN(TypeName)
+
+#define RTC_DISALLOW_COPY_AND_ASSIGN(TypeName) \
+  DISALLOW_COPY_AND_ASSIGN(TypeName)
+
+#define RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
+   DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName)
+
 #endif  // OVERRIDES_WEBRTC_BASE_CONSTRUCTORMAGIC_H__