Remove the DownloadItem::TogglePause() interface.

chrome/browser/extensions/api/downloads/downloads_api.cc

Index: chrome/browser/extensions/api/downloads/downloads_api.cc
diff --git a/chrome/browser/extensions/api/downloads/downloads_api.cc b/chrome/browser/extensions/api/downloads/downloads_api.cc
index afc5fb7cb8dde580a590bf957f3f6bf0efbd11c4..be9e39421986c1bc1e11845a545dfa4425d1678b 100644
--- a/chrome/browser/extensions/api/downloads/downloads_api.cc
+++ b/chrome/browser/extensions/api/downloads/downloads_api.cc
@@ -703,9 +703,10 @@ bool DownloadsPauseFunction::RunImpl() {
     // This could be due to an invalid download ID, or it could be due to the
     // download not being currently active.
     error_ = download_extension_errors::kInvalidOperationError;
-  } else if (!download_item->IsPaused()) {
-    // If download_item->IsPaused() already then we treat it as a success.
-    download_item->TogglePause();
+  } else {
+    // If the item is already paused, this is a no-op and the
+    // operation will silently succeed.
+    download_item->Pause();
   }
   if (error_.empty())
     RecordApiFunctions(DOWNLOADS_FUNCTION_PAUSE);
@@ -725,9 +726,10 @@ bool DownloadsResumeFunction::RunImpl() {
     // This could be due to an invalid download ID, or it could be due to the
     // download not being currently active.
     error_ = download_extension_errors::kInvalidOperationError;
-  } else if (download_item->IsPaused()) {
-    // If !download_item->IsPaused() already, then we treat it as a success.
-    download_item->TogglePause();
+  } else {
+    // Note that if the item isn't paused, this will be a no-op, and
+    // we will silently treat the extension call as a success.
+    download_item->Resume();
   }
   if (error_.empty())
     RecordApiFunctions(DOWNLOADS_FUNCTION_RESUME);