libutils: hide SharedBuffer by moving SharedBuffer.h to the implementation directory

Some methods in header files of classes using SharedBuffer need
to be moved to the implementation files accordingly

Change-Id: I891f3ace2b940ab219e4e449040bfed71c0547db
diff --git a/include/utils/BasicHashtable.h b/include/utils/BasicHashtable.h
index c235d62..cf47059 100644
--- a/include/utils/BasicHashtable.h
+++ b/include/utils/BasicHashtable.h
@@ -19,7 +19,6 @@
 
 #include <stdint.h>
 #include <sys/types.h>
-#include <utils/SharedBuffer.h>
 #include <utils/TypeHelpers.h>
 
 namespace android {
@@ -55,13 +54,7 @@
     virtual ~BasicHashtableImpl();
 
     void dispose();
-
-    inline void edit() {
-        if (mBuckets && !SharedBuffer::bufferFromData(mBuckets)->onlyOwner()) {
-            clone();
-        }
-    }
-
+    void edit();
     void setTo(const BasicHashtableImpl& other);
     void clear();