Replace PruneAllButActive with PruneAllButVisible.

chrome/browser/ui/search/instant_extended_interactive_uitest.cc

Index: chrome/browser/ui/search/instant_extended_interactive_uitest.cc
diff --git a/chrome/browser/ui/search/instant_extended_interactive_uitest.cc b/chrome/browser/ui/search/instant_extended_interactive_uitest.cc
index fba91068a59350c86c58c83bc1dbae40f208fe17..08f93d51b6945b9285b3ea06d65d0fd08b7a9cdb 100644
--- a/chrome/browser/ui/search/instant_extended_interactive_uitest.cc
+++ b/chrome/browser/ui/search/instant_extended_interactive_uitest.cc
@@ -874,6 +874,7 @@ IN_PROC_BROWSER_TEST_F(InstantExtendedTest, PreloadedNTPRenderViewGone) {
   EXPECT_EQ(NULL, instant()->ntp());
 
   // Open new tab. Should use local NTP.
+  // TODO(creis): Same problem.
   ui_test_utils::NavigateToURLWithDisposition(
       browser(),
       GURL(chrome::kChromeUINewTabURL),
@@ -896,6 +897,7 @@ IN_PROC_BROWSER_TEST_F(InstantExtendedTest, PreloadedNTPDoesntSupportInstant) {
   EXPECT_TRUE(instant()->ntp()->IsLocal());
 
   // Open new tab. Should use local NTP.
+  // TODO(creis): Same problem.
   ui_test_utils::NavigateToURLWithDisposition(
       browser(),
       GURL(chrome::kChromeUINewTabURL),
@@ -2322,6 +2324,10 @@ class InstantExtendedFirstTabTest : public InProcessBrowserTest,
 IN_PROC_BROWSER_TEST_F(
     InstantExtendedFirstTabTest, MAYBE_RedirectToLocalOnLoadFailure) {
   // Create a new window to test the first NTP load.
+  // TODO(creis): This fails in BrowserInstantController's
+  // MaybeSwapInInstantNTPContents because the pending entry hasn't
+  // committed yet.  It's trying to SwapInInstantNTP as part of the OpenURL
+  // call, which can't work.  (What if the navigation were to fail?)
   ui_test_utils::NavigateToURLWithDisposition(
       browser(),
       GURL(chrome::kChromeUINewTabURL),
@@ -2353,6 +2359,7 @@ IN_PROC_BROWSER_TEST_F(
 
   // Instant tab contents should be preloaded.
   ASSERT_NE(static_cast<InstantTab*>(NULL), instant()->instant_tab());
+  // TODO(creis): This is where the test fails.
   EXPECT_TRUE(instant()->instant_tab()->IsLocal());
 }