Revert of Fix issue of localDescription and remoteDescription getter.

public/platform/WebRTCSessionDescription.h

Index: public/platform/WebRTCSessionDescription.h
diff --git a/public/platform/WebRTCSessionDescription.h b/public/platform/WebRTCSessionDescription.h
index 561f1be35dbf0afc61cfe8918e04b4d583254ab4..a4b174614511243ea34c21bb596350decb9752b7 100644
--- a/public/platform/WebRTCSessionDescription.h
+++ b/public/platform/WebRTCSessionDescription.h
@@ -63,14 +63,6 @@
         assign(other);
         return *this;
     }
-    bool operator==(const WebRTCSessionDescription& other)
-    {
-        return sdp() == other.sdp() && type() == other.type();
-    }
-    bool operator!=(const WebRTCSessionDescription& other)
-    {
-        return !(*this == other);
-    }
 
     BLINK_PLATFORM_EXPORT void assign(const WebRTCSessionDescription&);