Transfer WebCrypto databuffers across the Blink API using blink::WebVector.

third_party/WebKit/public/platform/WebVector.h

Index: third_party/WebKit/public/platform/WebVector.h
diff --git a/third_party/WebKit/public/platform/WebVector.h b/third_party/WebKit/public/platform/WebVector.h
index 27a372417bc19988ab40edee4da2ceb409fb0bf8..f190202d44b1728a06d57315088b1a661fdfe02b 100644
--- a/third_party/WebKit/public/platform/WebVector.h
+++ b/third_party/WebKit/public/platform/WebVector.h
@@ -93,6 +93,11 @@ public:
     {
     }
 
+    WebVector(WebVector<T>&& other)
+    {
+        swap(other);
+    }
+
     WebVector& operator=(const WebVector& other)
     {
         if (this != &other)
@@ -100,6 +105,13 @@ public:
         return *this;
     }
 
+    WebVector& operator=(WebVector&& other)
+    {
+        if (this != &other)
+            swap(other);
+        return *this;
+    }
+
     template <typename C>
     WebVector<T>& operator=(const C& other)
     {