Disabling flaky WebViewTest.Shim_TestAutosizeWithPartialAttributes

This test (for unknown reasons) depends on the frame being visible and
currently only passes because of an artificial delay in the compositor when
going invisible. This is probably way it is already disabled on Mac and
Windows.

The patch at http://crrev.com/1051123002 removes this delay causing this test
to become extremely flaky. See http://crbug.com/282116

BUG=282116
R=lazyboy,fsamuel

Review URL: https://codereview.chromium.org/1069803003

Cr-Commit-Position: refs/heads/master@{#324387}

chrome/browser/apps/guest_view/web_view_browsertest.cc

@@ -981,15 +981,8 @@ IN_PROC_BROWSER_TEST_F(WebViewTest, Shim_TestAutosizeRemoveAttributes) {
 }
 
 // This test is disabled due to being flaky. http://crbug.com/282116
-#if defined(OS_WIN) || defined(OS_MACOSX)
-#define MAYBE_Shim_TestAutosizeWithPartialAttributes \
-    DISABLED_Shim_TestAutosizeWithPartialAttributes
-#else
-#define MAYBE_Shim_TestAutosizeWithPartialAttributes \
-    Shim_TestAutosizeWithPartialAttributes
-#endif
 IN_PROC_BROWSER_TEST_F(WebViewTest,
-                       MAYBE_Shim_TestAutosizeWithPartialAttributes) {
+                       DISABLED_Shim_TestAutosizeWithPartialAttributes) {
   TestHelper("testAutosizeWithPartialAttributes",
              "web_view/shim",
              NO_TEST_SERVER);