Remove Tabpose feature on mac, and supporting infrastructure (PaintAtSize)

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 5c55b0d3022f31b18ad7a781f6411889489d2894..3a56bc39f690c441ce43238c54fd4f9e9c49dcd6 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -427,18 +427,6 @@ const Experiment::Choice kNotificationCenterTrayBehaviorChoices[] = {
 // When adding a new choice, add it to the end of the list.
 const Experiment kExperiments[] = {
   {
-    "expose-for-tabs",  // FLAGS:RECORD_UMA
-    IDS_FLAGS_TABPOSE_NAME,
-    IDS_FLAGS_TABPOSE_DESCRIPTION,
-    kOsMac,
-#if defined(OS_MACOSX)
-    // The switch exists only on OS X.
-    SINGLE_VALUE_TYPE(switches::kEnableExposeForTabs)
-#else
-    SINGLE_VALUE_TYPE("")
-#endif
-  },
-  {
     "conflicting-modules-check",  // FLAGS:RECORD_UMA
     IDS_FLAGS_CONFLICTS_CHECK_NAME,
     IDS_FLAGS_CONFLICTS_CHECK_DESCRIPTION,