trace_processor: Fix deallocation mismatch
trace_processor: Fix deallocation mismatch

When GetLine() returns a "new char[1024]", we need to use the
delete[] operator to deallocate the memory.

Test: TreeHugger
Change-Id: I34a92033c2dfc615ad8f27e44b348de28dfdf60b

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto