Hook up SetInstantPreviewHeight for ChromeOS.

chrome/browser/instant/instant_controller.cc

Index: chrome/browser/instant/instant_controller.cc
diff --git a/chrome/browser/instant/instant_controller.cc b/chrome/browser/instant/instant_controller.cc
index 869c0293123248bbdc986880c17051b1d6508f90..442eab662dfb347a880d4481e436e72103d16541 100644
--- a/chrome/browser/instant/instant_controller.cc
+++ b/chrome/browser/instant/instant_controller.cc
@@ -507,6 +507,16 @@ void InstantController::CommitInstantLoader(InstantLoader* loader) {
   CommitCurrentPreview(INSTANT_COMMIT_FOCUS_LOST);
 }
 
+void InstantController::SetInstantPreviewHeight(InstantLoader* loader,
+                                                int height,
+                                                InstantSizeUnits units) {
+  DCHECK_EQ(loader_.get(), loader);
+  if (loader_ != loader || mode_ != EXTENDED)
+    return;
+
+  delegate_->SetInstantPreviewHeight(height, units);
+}
+
 void InstantController::InstantLoaderPreviewLoaded(InstantLoader* loader) {
   DCHECK_EQ(loader_.get(), loader);
   AddPreviewUsageForHistogram(mode_, PREVIEW_LOADED);