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 1f806bdf2f0a529d7974a02e2df2310bcb1c51bf..44c9229535cc035b7489d2e95c751f2a81d5617d 100644
--- a/chrome/browser/ui/search/instant_extended_interactive_uitest.cc
+++ b/chrome/browser/ui/search/instant_extended_interactive_uitest.cc
@@ -882,6 +882,7 @@ 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),
@@ -904,6 +905,7 @@ 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),
@@ -2454,6 +2456,10 @@ class InstantExtendedFirstTabTest : public InProcessBrowserTest,
 IN_PROC_BROWSER_TEST_F(
     InstantExtendedFirstTabTest, DISABLED_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),
@@ -2485,6 +2491,7 @@ 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());
 }