Inline DISALLOW_COPY_AND_ASSIGN.

snappy-stubs-public.h defined the DISALLOW_COPY_AND_ASSIGN macro, so the
definition propagated to all translation units that included the open
source headers. The macro is now inlined, thus avoiding polluting the
macro environment of snappy users.

snappy-internal.h

@@ -50,7 +50,9 @@ class WorkingMemory {
   uint16 small_table_[1<<10];    // 2KB
   uint16* large_table_;          // Allocated only when needed
 
-  DISALLOW_COPY_AND_ASSIGN(WorkingMemory);
+  // No copying
+  WorkingMemory(const WorkingMemory&);
+  void operator=(const WorkingMemory&);
 };
 
 // Flat array compression that does not emit the "uncompressed length"