Add chrome.webstore API methods to allow sites to see progress of installation

chrome/browser/extensions/install_observer.cc

Index: chrome/browser/extensions/install_observer.cc
diff --git a/chrome/browser/extensions/install_observer.cc b/chrome/browser/extensions/install_observer.cc
index d713a09d36d9eba3de604e606a2a1150d4021a43..37c7565cc6b0369e7629de1d3b3778b324d92fe1 100644
--- a/chrome/browser/extensions/install_observer.cc
+++ b/chrome/browser/extensions/install_observer.cc
@@ -19,19 +19,4 @@ InstallObserver::ExtensionInstallParams::ExtensionInstallParams(
           is_platform_app(is_platform_app),
           is_ephemeral(false) {}
 
-void InstallObserver::OnBeginExtensionInstall(
-    const ExtensionInstallParams& params) {}
-void InstallObserver::OnDownloadProgress(const std::string& extension_id,
-                                         int percent_downloaded) {}
-void InstallObserver::OnInstallFailure(const std::string& extension_id) {}
-void InstallObserver::OnExtensionInstalled(const Extension* extension) {}
-void InstallObserver::OnExtensionLoaded(const Extension* extension) {}
-void InstallObserver::OnExtensionUnloaded(const Extension* extension) {}
-void InstallObserver::OnExtensionUninstalled(const Extension* extension) {}
-void InstallObserver::OnDisabledExtensionUpdated(const Extension* extension) {}
-void InstallObserver::OnAppInstalledToAppList(const std::string& extension_id) {
-}
-void InstallObserver::OnAppsReordered() {}
-void InstallObserver::OnShutdown() {}
-
 }  // namespace extensions