Updating DCHECK() to DCHECK_GE() in base/ dir

base/mach_ipc_mac.h

Index: base/mach_ipc_mac.h
diff --git a/base/mach_ipc_mac.h b/base/mach_ipc_mac.h
index d506a00c89d657e0c2262d9a8de43bc85dfcc9ca..a527d63f87675e7de8b7686ab7dbd33ebd626696 100644
--- a/base/mach_ipc_mac.h
+++ b/base/mach_ipc_mac.h
@@ -220,13 +220,8 @@ class MachMessage {
     u_int8_t           padding[1024];
   };
 
- // kEmptyMessageSize needs to have the definition of MachMessageData before
- // it.
  public:
-   // The size of an empty message with no data.
-  static const size_t kEmptyMessageSize = sizeof(mach_msg_header_t) +
-                                          sizeof(mach_msg_body_t) +
-                                          sizeof(MessageDataPacket);
+  static const size_t kEmptyMessageSize;
 
  private:
   MachMessageData *storage_;