Make InstallObserver methods not pure-virtual

chrome/browser/ui/app_list/search/webstore/webstore_result.cc

Index: chrome/browser/ui/app_list/search/webstore/webstore_result.cc
diff --git a/chrome/browser/ui/app_list/search/webstore/webstore_result.cc b/chrome/browser/ui/app_list/search/webstore/webstore_result.cc
index fdcc4481ff801241321a3e903633c690db07caf9..a698e220777eeed80a50e0b332091998e7d90aa9 100644
--- a/chrome/browser/ui/app_list/search/webstore/webstore_result.cc
+++ b/chrome/browser/ui/app_list/search/webstore/webstore_result.cc
@@ -224,9 +224,6 @@ void WebstoreResult::StopObservingInstall() {
   install_tracker_ = NULL;
 }
 
-void WebstoreResult::OnBeginExtensionInstall(
-    const ExtensionInstallParams& params) {}
-
 void WebstoreResult::OnDownloadProgress(const std::string& extension_id,
                                         int percent_downloaded) {
   if (extension_id != app_id_ || percent_downloaded < 0)
@@ -235,8 +232,6 @@ void WebstoreResult::OnDownloadProgress(const std::string& extension_id,
   SetPercentDownloaded(percent_downloaded);
 }
 
-void WebstoreResult::OnInstallFailure(const std::string& extension_id) {}
-
 void WebstoreResult::OnExtensionInstalled(
     const extensions::Extension* extension) {
   if (extension->id() != app_id_)
@@ -247,19 +242,6 @@ void WebstoreResult::OnExtensionInstalled(
   NotifyItemInstalled();
 }
 
-void WebstoreResult::OnExtensionLoaded(
-    const extensions::Extension* extension) {}
-
-void WebstoreResult::OnExtensionUnloaded(
-    const extensions::Extension* extension) {}
-
-void WebstoreResult::OnExtensionUninstalled(
-    const extensions::Extension* extension) {}
-
-void WebstoreResult::OnAppsReordered() {}
-
-void WebstoreResult::OnAppInstalledToAppList(const std::string& extension_id) {}
-
 void WebstoreResult::OnShutdown() {
   StopObservingInstall();
 }