Remove DetermineIfPageSupportsInstant and all its plumbing

chrome/common/instant.mojom

Index: chrome/common/instant.mojom
diff --git a/chrome/common/instant.mojom b/chrome/common/instant.mojom
index 45c9da14459ae37605360fd02687ab4b90fb7b83..1a53f2c1a04db2b15643c78478b119f557ae9534 100644
--- a/chrome/common/instant.mojom
+++ b/chrome/common/instant.mojom
@@ -35,11 +35,8 @@ interface EmbeddedSearchConnector {
 //
 // Browser interface to support embedded search. Render frames connect to this
 // interface to query browser data, such as the most visited pages.
+// See http://dev.chromium.org/embeddedsearch
 interface Instant {
-  // Tells InstantExtended whether the embedded search API is supported.
-  // See http://dev.chromium.org/embeddedsearch
-  InstantSupportDetermined(int32 page_seq_no, bool result);
-
   // Tells InstantExtended to set the omnibox focus state.
   FocusOmnibox(int32 page_seq_no, OmniboxFocusState state);
 
@@ -104,8 +101,6 @@ struct ThemeBackgroundInfo;
 interface SearchBox {
   SetPageSequenceNumber(int32 page_seq_no);
 
-  DetermineIfPageSupportsInstant();
-
   FocusChanged(OmniboxFocusState new_focus_state,
                OmniboxFocusChangeReason reason);