Replace manual casting to rvalue reference with calls to std::move

webrtc/base/buffer.h

Index: webrtc/base/buffer.h
diff --git a/webrtc/base/buffer.h b/webrtc/base/buffer.h
index 076fa08f26e10c3b750b01b9f07314391dd5054a..bf2e9f3c933d031a4a28546333f70a8162e35d82 100644
--- a/webrtc/base/buffer.h
+++ b/webrtc/base/buffer.h
@@ -172,7 +172,7 @@ class Buffer {
   // b.Pass() does the same thing as std::move(b).
   Buffer&& Pass() {
     assert(IsConsistent());
-    return static_cast<Buffer&&>(*this);
+    return std::move(*this);
   }
 
   // Resets the buffer to zero size and capacity. Works even if the buffer has