Revert "[Tab Scrolling] Add test for tabstrip resizing when dragging."

This reverts commit a4b670d5.

Reason for revert: Test is flaky/failing on https://ci.chromium.org/p/chromium/builders/ci/Linux%20Tests

https://ci.chromium.org/p/chromium/builders/ci/Linux%20Tests/95514?

../../chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc:2470: Failure
Expected equality of these values:
  tab_strip_width + TabStyle::GetStandardWidth()
    Which is: 751
  tab_strip->width()
    Which is: 761

Original change's description:
> [Tab Scrolling] Add test for tabstrip resizing when dragging.
>
> When the browser window is large enough, the tabstrip should expand to
> accommodate tabs dragging past the last tab. This is a test for
> crrev.com/c/2472577
>
> Bug: 1141674
> Change-Id: Icfb4b0d6b9ebfa243a0e352b0cef68a2a6f2c263
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537068
> Reviewed-by: Taylor Bergquist <tbergquist@chromium.org>
> Commit-Queue: Charlene Yan <cyan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#827998}

TBR=tbergquist@chromium.org,cyan@chromium.org

Change-Id: Iaee8c99d3a53eb4f1031d969b01e39d86febe6a3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1141674
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545744Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828425}

chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc

@@ -36,7 +36,6 @@
 #include "chrome/browser/ui/tabs/tab_group.h"
 #include "chrome/browser/ui/tabs/tab_group_model.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
-#include "chrome/browser/ui/tabs/tab_style.h"
 #include "chrome/browser/ui/ui_features.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "chrome/browser/ui/views/frame/native_browser_frame_factory.h"
@@ -2436,41 +2435,6 @@ IN_PROC_BROWSER_TEST_P(
   EXPECT_EQ(browser2_groups[0], group);
 }
 
-class DetachToBrowserTabDragControllerTestWithScrollableTabStripEnabled
-    : public DetachToBrowserTabDragControllerTest {
- public:
-  DetachToBrowserTabDragControllerTestWithScrollableTabStripEnabled() {
-    scoped_feature_list_.InitWithFeatures({features::kScrollableTabStrip}, {});
-  }
-
- private:
-  base::test::ScopedFeatureList scoped_feature_list_;
-};
-
-// Creates a browser with two tabs and drags the rightmost tab. Given the
-// browser window is large enough, the tabstrip should expand to accommodate
-// this tab. Note: There must be at least two tabs because dragging a singular
-// tab will drag the window.
-IN_PROC_BROWSER_TEST_P(
-    DetachToBrowserTabDragControllerTestWithScrollableTabStripEnabled,
-    DraggingRightExpandsTabStripSize) {
-  TabStrip* tab_strip = GetTabStripForBrowser(browser());
-
-  AddTabsAndResetBrowser(browser(), 1);
-
-  browser()->window()->SetBounds(
-      gfx::Rect(0, 0, TabStyle::GetStandardWidth() * 4, 400));
-
-  const int tab_strip_width = tab_strip->width();
-  const gfx::Point tab_1_center =
-      GetCenterInScreenCoordinates(tab_strip->tab_at(1));
-  ASSERT_TRUE(PressInput(tab_1_center));
-  ASSERT_TRUE(DragInputTo(tab_1_center +
-                          gfx::Vector2d(TabStyle::GetStandardWidth(), 0)));
-  EXPECT_EQ(tab_strip_width + TabStyle::GetStandardWidth(), tab_strip->width());
-  ASSERT_TRUE(ReleaseInput());
-}
-
 namespace {
 
 // Invoked from the nested run loop.
@@ -4390,10 +4354,6 @@ INSTANTIATE_TEST_SUITE_P(
     TabDragging,
     DetachToBrowserTabDragControllerTestWithTabGroupsCollapseEnabled,
     ::testing::Values("mouse", "touch"));
-INSTANTIATE_TEST_SUITE_P(
-    TabDragging,
-    DetachToBrowserTabDragControllerTestWithScrollableTabStripEnabled,
-    ::testing::Values("mouse", "touch"));
 INSTANTIATE_TEST_SUITE_P(TabDragging,
                          DetachToBrowserInSeparateDisplayTabDragControllerTest,
                          ::testing::Values("mouse"));
@@ -4419,8 +4379,4 @@ INSTANTIATE_TEST_SUITE_P(
     TabDragging,
     DetachToBrowserTabDragControllerTestWithTabGroupsCollapseEnabled,
     ::testing::Values("mouse"));
-INSTANTIATE_TEST_SUITE_P(
-    TabDragging,
-    DetachToBrowserTabDragControllerTestWithScrollableTabStripEnabled,
-    ::testing::Values("mouse"));
 #endif