Issue Description:

Edge+Narrator:

• Narrator is announcing the entire row details when focus is on first column header.
• Narrator is also announcing incorrect total column number count (i.e., 1 of 0; 2 of 0; 3 of 0...)
• Verified with Edge Browser (Version : 44.18362.387.0).
• Please find attached video for reference.
  Edge+Narrator_GridHeaderRow.zip

Chrome+NVDA:

• NVDA(2019.2.1) is announcing incorrect row position number like 18 for the column header.
• Verified with Chrome browser(77.0.3865.120 (Official Build) (64-bit))
  Chrome+NVDA_GridHeaderRow.zip
  

Try Outs:

• Applied aria-rowindex and aria-columnindex to row div and column header cell div. But it still reading the same way