Change commit timeout from 10s to 30s.

Bug: 848821
Change-Id: I5e0dd225cdf7163e159286352a096c9cffe1d32b
Reviewed-on: https://chromium-review.googlesource.com/1188965Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586053}

content/browser/frame_host/navigation_handle_impl.cc

@@ -49,10 +49,11 @@ namespace content {
 
 namespace {
 
-// Default timeout for the READY_TO_COMMIT -> COMMIT transition.
-// Chosen based on the Navigation.ReadyToCommitUntilCommit UMA.
+// Default timeout for the READY_TO_COMMIT -> COMMIT transition.  Chosen
+// initially based on the Navigation.ReadyToCommitUntilCommit UMA, and then
+// refined based on feedback based on CrashExitCodes.Renderer/RESULT_CODE_HUNG.
 constexpr base::TimeDelta kDefaultCommitTimeout =
-    base::TimeDelta::FromSeconds(10);
+    base::TimeDelta::FromSeconds(30);
 
 // Timeout for the READY_TO_COMMIT -> COMMIT transition.
 // Overrideable via SetCommitTimeoutForTesting.