Implement DriveAPIService::UninstallApp().

chrome/browser/drive/drive_api_service.cc

Index: chrome/browser/drive/drive_api_service.cc
diff --git a/chrome/browser/drive/drive_api_service.cc b/chrome/browser/drive/drive_api_service.cc
index 6ded526202bf61e3cf7bb914054eef862f0990e5..46f4e9fe90bc824243e7454dcaff1da2e521ba3a 100644
--- a/chrome/browser/drive/drive_api_service.cc
+++ b/chrome/browser/drive/drive_api_service.cc
@@ -310,10 +310,10 @@ void DriveAPIService::Initialize(const std::string& account_id) {
   std::vector<std::string> scopes;
   scopes.push_back(kDriveScope);
   scopes.push_back(kDriveAppsReadonlyScope);
+  scopes.push_back(util::kDriveAppsScope);
 
-  // GData WAPI token. These are for GetShareUrl().
+  // GData WAPI token for GetShareUrl() and GetResourceListInDirectoryByWapi().
   scopes.push_back(util::kDocsListScope);
-  scopes.push_back(util::kDriveAppsScope);
 
   sender_.reset(new RequestSender(
       new google_apis::AuthService(oauth2_token_service_,
@@ -798,9 +798,11 @@ CancelCallback DriveAPIService::UninstallApp(
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
-  // TODO(kinaba) implement.
-  NOTREACHED();
-  return CancelCallback();
+  google_apis::drive::AppsDeleteRequest* request =
+      new google_apis::drive::AppsDeleteRequest(sender_.get(), url_generator_,
+                                                callback);
+  request->set_app_id(app_id);
+  return sender_->StartRequestWithRetry(request);
 }
 
 CancelCallback DriveAPIService::GetResourceListInDirectoryByWapi(