Revert of [SP] Temporarily disable two frame navigation tests made flaky by slimming paint.

content/browser/session_history_browsertest.cc

Index: content/browser/session_history_browsertest.cc
diff --git a/content/browser/session_history_browsertest.cc b/content/browser/session_history_browsertest.cc
index b85c68bbc9345cc172c39adcdfa1385a7992a24d..263d66d704926e09cc552db7ce95bf0cb89a35ff 100644
--- a/content/browser/session_history_browsertest.cc
+++ b/content/browser/session_history_browsertest.cc
@@ -178,8 +178,7 @@
 
 // Test that back/forward works when navigating in subframes.
 // If this flakes, use http://crbug.com/48833
-// TODO(wkorman): Re-enable after fix for http://crbug.com/498938 is in.
-IN_PROC_BROWSER_TEST_F(SessionHistoryTest, DISABLED_FrameBackForward) {
+IN_PROC_BROWSER_TEST_F(SessionHistoryTest, FrameBackForward) {
   ASSERT_FALSE(CanGoBack());
 
   ASSERT_NO_FATAL_FAILURE(NavigateAndCheckTitle("frames.html", "bot1"));
@@ -236,8 +235,7 @@
 
 // Test that back/forward preserves POST data and document state in subframes.
 // If this flakes use http://crbug.com/61619
-// TODO(wkorman): Re-enable after fix for http://crbug.com/498938 is in.
-IN_PROC_BROWSER_TEST_F(SessionHistoryTest, DISABLED_FrameFormBackForward) {
+IN_PROC_BROWSER_TEST_F(SessionHistoryTest, FrameFormBackForward) {
   ASSERT_FALSE(CanGoBack());
 
   ASSERT_NO_FATAL_FAILURE(NavigateAndCheckTitle("frames.html", "bot1"));