You Do Need power plug adapter while traveling from Chile to Tahiti.

Here is Why You Need An Adapter

The outlet and plug type used in Tahiti are C and E and in Chile are C and L. This is how they look like.

Chile

In Chile, outlets of type C and L are in use.

Type C

Type L

Tahiti

In Tahiti, outlets of type C and E are in use.

Type C

Type E