Disable LookUpStringForRangeRoutesToFocusedWidget on Mac

TBR=wjmaclean@chromium.org
NOTRY=true

Bug: 874417
Change-Id: Ide6bc7a1fd7d8cc25d96204a2e43f446d2782c3d
Reviewed-on: https://chromium-review.googlesource.com/1175842
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583241}

chrome/browser/renderer_host/site_per_process_text_input_browsertest.cc

@@ -1311,10 +1311,17 @@ class ShowDefinitionForWordObserver
   DISALLOW_COPY_AND_ASSIGN(ShowDefinitionForWordObserver);
 };
 
+#if defined(OS_MACOSX)
+#define MAYBE_LookUpStringForRangeRoutesToFocusedWidget \
+  DISABLED_LookUpStringForRangeRoutesToFocusedWidget
+#else
+#define MAYBE_LookUpStringForRangeRoutesToFocusedWidget \
+  LookUpStringForRangeRoutesToFocusedWidget
+#endif
 // This test verifies that requests for dictionary lookup based on selection
 // range are routed to the focused RenderWidgetHost.
 IN_PROC_BROWSER_TEST_F(SitePerProcessTextInputManagerTest,
-                       LookUpStringForRangeRoutesToFocusedWidget) {
+                       MAYBE_LookUpStringForRangeRoutesToFocusedWidget) {
   CreateIframePage("a(b)");
   std::vector<content::RenderFrameHost*> frames{GetFrame(IndexVector{}),
                                                 GetFrame(IndexVector{0})};