Make InstallObserver methods not pure-virtual

chrome/browser/ui/app_list/recommended_apps.cc

Index: chrome/browser/ui/app_list/recommended_apps.cc
diff --git a/chrome/browser/ui/app_list/recommended_apps.cc b/chrome/browser/ui/app_list/recommended_apps.cc
index 94b4edd3395be5b6062675a83237437b02a521e3..01c20df1023901feb6a61ba061453d21568bb6e1 100644
--- a/chrome/browser/ui/app_list/recommended_apps.cc
+++ b/chrome/browser/ui/app_list/recommended_apps.cc
@@ -98,14 +98,6 @@ void RecommendedApps::Update() {
   }
 }
 
-void RecommendedApps::OnBeginExtensionInstall(
-    const ExtensionInstallParams& params) {}
-
-void RecommendedApps::OnDownloadProgress(const std::string& extension_id,
-                                int percent_downloaded) {}
-
-void RecommendedApps::OnInstallFailure(const std::string& extension_id) {}
-
 void RecommendedApps::OnExtensionInstalled(
     const extensions::Extension* extension) {
   Update();
@@ -126,11 +118,4 @@ void RecommendedApps::OnExtensionUninstalled(
   Update();
 }
 
-void RecommendedApps::OnAppsReordered() {}
-
-void RecommendedApps::OnAppInstalledToAppList(
-    const std::string& extension_id) {}
-
-void RecommendedApps::OnShutdown() {}
-
 }  // namespace app_list