Disable ThemeChangedWhenApplyingNewTheme on Linux ASAN

The test was flaky on Win and Mac but not after Jan 25 [1]. Disable it on
Linux for now.

[1]: https://analysis.chromium.org/p/chromium/flake-portal/flakes/occurrences?key=ag9zfmZpbmRpdC1mb3ItbWVyUwsSBUZsYWtlIkhjaHJvbWl1bUBicm93c2VyX3Rlc3RzQEluc3RhbnRUaGVtZVRlc3QuVGhlbWVDaGFuZ2VkV2hlbkFwcGx5aW5nTmV3VGhlbWUM&show_all_occurrences=1

TBR=sweilun@chromium.org

Bug: 1045708
Change-Id: If47bee4e8eaca59e68138b57606c6e81d69a2090
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2025641Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736032}

chrome/browser/ui/search/instant_theme_browsertest.cc

@@ -4,6 +4,7 @@
 
 #include "base/feature_list.h"
 #include "base/macros.h"
+#include "build/build_config.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/profiles/profile.h"
@@ -269,7 +270,15 @@ IN_PROC_BROWSER_TEST_F(InstantThemeTest, ThemeAppliedToNewTab) {
   EXPECT_EQ(css_text, new_tab_css_text);
 }
 
-IN_PROC_BROWSER_TEST_F(InstantThemeTest, ThemeChangedWhenApplyingNewTheme) {
+// The test is flaky on linux asan. crbug.com/1045708.
+#if defined(OS_LINUX) && defined(ADDRESS_SANITIZER)
+#define MAYBE_ThemeChangedWhenApplyingNewTheme \
+  DISABLED_ThemeChangedWhenApplyingNewTheme
+#else
+#define MAYBE_ThemeChangedWhenApplyingNewTheme ThemeChangedWhenApplyingNewTheme
+#endif
+IN_PROC_BROWSER_TEST_F(InstantThemeTest,
+                       MAYBE_ThemeChangedWhenApplyingNewTheme) {
   // On the existing tab.
   ASSERT_EQ(1, browser()->tab_strip_model()->count());
   ASSERT_EQ(0, browser()->tab_strip_model()->active_index());