Upstream unit test fails due to next tab not moving to correct index upon tab removal

[emerick]

This upstream unit test fails due to the next tab not moving to the correct index upon tab removal.

This test is affected:

• TabContainerTest.RemoveTabInGroupWithTabClosingMode

[emerick]

Sample stack trace:

[ RUN      ] TabContainerTest.RemoveTabInGroupWithTabClosingMode
..\..\chrome\browser\ui\views\tabs\tab_container_unittest.cc(402): error: Value of: tab_next_close_button->GetBoundsInScreen().Contains(tab_center)
  Actual: false
Expected: true
Stack trace:
Backtrace:
        GetPakFileHashes [0x00007FF6F21372B0+21970224]

[emerick]

Sample stack trace:

[ RUN      ] TabContainerTest.RemoveTabInGroupWithTabClosingMode
..\..\chrome\browser\ui\views\tabs\tab_container_unittest.cc(402): error: Value of: tab_next_close_button->GetBoundsInScreen().Contains(tab_center)
  Actual: false
Expected: true
Stack trace:
Backtrace:
        GetPakFileHashes [0x00007FF6F21372B0+21970224]