Revert 249676 "Have the unload event execute in background on cr..."

Speculative revert to see if it resolves bug 345757.
Suspected because UnregisterRenderFrameHost could lead to RenderViewHost
outliving WebContents, causing at least some of the ObserverListBase
crashes we're seeing.

> Have the unload event execute in background on cross-site navigations
> 
> Cross-site navigations trigger renderer swap. This CL makes it so that the swap
> does not need for the old renderer unload event to be fired. Instead, it will
> be executed in the background, and the new renderer will be swapped in
> immediately.
> BUG=323528
> 
> Review URL: https://codereview.chromium.org/88503002

TBR=clamy@chromium.org

Review URL: https://codereview.chromium.org/177093009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253018 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 4 insertions, 7 deletions

diff --git a/chrome/browser/renderer_host/web_cache_manager_browsertest.cc b/chrome/browser/renderer_host/web_cache_manager_browsertest.cc
index 7caee2f..a917ed5 100644
--- a/chrome/browser/renderer_host/web_cache_manager_browsertest.cc
+++ b/chrome/browser/renderer_host/web_cache_manager_browsertest.cc
@@ -57,13 +57,10 @@ IN_PROC_BROWSER_TEST_F(WebCacheManagerBrowserTest, CrashOnceOnly) {
 
   ui_test_utils::NavigateToURL(browser(), url);
 
-  // Depending on the speed of execution of the unload event, we may have one or
-  // two active renderers at that point (one executing the unload event in
-  // background).
-  EXPECT_GE(WebCacheManager::GetInstance()->active_renderers_.size(), 1U);
-  EXPECT_LE(WebCacheManager::GetInstance()->active_renderers_.size(), 2U);
+  EXPECT_EQ(
+      WebCacheManager::GetInstance()->active_renderers_.size(), 1U);
   EXPECT_EQ(
       WebCacheManager::GetInstance()->inactive_renderers_.size(), 0U);
-  EXPECT_GE(WebCacheManager::GetInstance()->stats_.size(), 1U);
-  EXPECT_LE(WebCacheManager::GetInstance()->stats_.size(), 2U);
+  EXPECT_EQ(
+      WebCacheManager::GetInstance()->stats_.size(), 1U);
 }