Delete CRWWebViewScrollViewProxyTest.MultipleWebViewScrollViewProxies.

This test tests a use case which is not really supported by
CRWWebViewScrollViewProxy. So I believe this should rather be deleted.

CRWWebViewScrollViewProxy doesn't really support setting up multiple
proxies for a single UIScrollView. If you try it with a real
UIScrollView, it hits an assertion here:
https://cs.chromium.org/chromium/src/ios/web/web_state/ui/crw_web_view_scroll_view_proxy.mm?l=73&rcl=c8f602e2f2dae5bdbde111f556474f3373c23a3d

This test currently passes just because it uses a mock UIScrollView.

Change-Id: Ib85ec49db033cd894f84d53a5053d1a006b1ff59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1939139
Auto-Submit: Hiroshi Ichikawa <ichikawa@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Hiroshi Ichikawa <ichikawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720824}

ios/web/web_state/ui/crw_web_view_scroll_view_proxy_unittest.mm

@@ -233,31 +233,6 @@ TEST_F(CRWWebViewScrollViewProxyTest, ReleasingAScrollView) {
   [webViewScrollViewProxy_ setScrollView:nil];
 }
 
-// Tests that multiple WebViewScrollViewProxies hold onto the same underlying
-// UIScrollView
-TEST_F(CRWWebViewScrollViewProxyTest, MultipleWebViewScrollViewProxies) {
-  [webViewScrollViewProxy_ setScrollView:mockScrollView_];
-
-  CRWWebViewScrollViewProxy* webViewScrollViewProxy1 =
-      [[CRWWebViewScrollViewProxy alloc] init];
-  [webViewScrollViewProxy1 setScrollView:mockScrollView_];
-
-  CRWWebViewScrollViewProxy* webViewScrollViewProxy2 =
-      [[CRWWebViewScrollViewProxy alloc] init];
-  [webViewScrollViewProxy2 setScrollView:mockScrollView_];
-
-  // Arbitrary point.
-  const CGPoint point = CGPointMake(10, 10);
-  [[[mockScrollView_ stub] andReturnValue:[NSValue valueWithCGPoint:point]]
-      contentOffset];
-  EXPECT_TRUE(
-      CGPointEqualToPoint(point, [webViewScrollViewProxy_ contentOffset]));
-  EXPECT_TRUE(
-      CGPointEqualToPoint(point, [webViewScrollViewProxy1 contentOffset]));
-  EXPECT_TRUE(
-      CGPointEqualToPoint(point, [webViewScrollViewProxy2 contentOffset]));
-}
-
 // Tests that CRWWebViewScrollViewProxy correctly delegates property setters to
 // the underlying UIScrollView.
 TEST_F(CRWWebViewScrollViewProxyTest, ScrollViewSetProperties) {