Bug 1271751 - part 6 - make ShiftData actually move its elements rather than copying; r=erahm

This change eliminates the last use of the Copy* family of functions.

xpcom/glue/nsTArray-inl.h

@@ -269,7 +269,7 @@ nsTArray_base<Alloc, Copy>::ShiftData(index_type aStart,
     aNewLen *= aElemSize;
     aOldLen *= aElemSize;
     char* baseAddr = reinterpret_cast<char*>(mHdr + 1) + aStart;
-    Copy::CopyOverlappingRegion(baseAddr + aNewLen, baseAddr + aOldLen, num, aElemSize);
+    Copy::MoveOverlappingRegion(baseAddr + aNewLen, baseAddr + aOldLen, num, aElemSize);
   }
 }