media/base: Fix incorrect comment in WritableUnalignedMapping.

When WritableUnalignedMapping takes a handle, it *does* own it (the temporary
shared memory region created in the constructor consumes the handle).

Bug: 849207
Change-Id: Icabca455727ad275d9c5a55065c5baf18f44e08c
Reviewed-on: https://chromium-review.googlesource.com/1152913Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Alexandr Ilin <alexilin@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579755}

media/base/unaligned_shared_memory.h

@@ -50,7 +50,7 @@ class MEDIA_EXPORT UnalignedSharedMemory {
 // offsets.
 class MEDIA_EXPORT WritableUnalignedMapping {
  public:
-  // Creates an |UnalignedSharedMemory| instance from a
+  // Creates an |WritableUnalignedMapping| instance from a
   // |UnsafeSharedMemoryRegion|. |size| sets the maximum size that may be mapped
   // within |region| and |offset| is the offset that will be mapped. |region| is
   // not retained and is used only in the constructor.
@@ -58,7 +58,7 @@ class MEDIA_EXPORT WritableUnalignedMapping {
                            size_t size,
                            off_t offset);
 
-  // As above, but creates from a handle. This region will not own the handle.
+  // As above, but creates from a handle. This region will own the handle.
   // DEPRECATED: this should be used only for the legacy shared memory
   // conversion project, see https://crbug.com/795291.
   WritableUnalignedMapping(const base::SharedMemoryHandle& handle,