Don't block InstallableManager::GetData calls when waiting for a service worker.

chrome/browser/installable/installable_manager.h

Index: chrome/browser/installable/installable_manager.h
diff --git a/chrome/browser/installable/installable_manager.h b/chrome/browser/installable/installable_manager.h
index 1a53d37bc7cb1580e30d07f5ac2a1acda24a3283..0a1c51c18ea83d8dc4ea27ac7f61101f288f94ac 100644
--- a/chrome/browser/installable/installable_manager.h
+++ b/chrome/browser/installable/installable_manager.h
@@ -194,7 +194,6 @@ class InstallableManager
   InstallableStatusCode valid_manifest_error() const;
   void set_valid_manifest_error(InstallableStatusCode error_code);
   InstallableStatusCode worker_error() const;
-  bool worker_waiting() const;
   InstallableStatusCode icon_error(const IconParams& icon_params);
   GURL& icon_url(const IconParams& icon_params);
   const SkBitmap* icon(const IconParams& icon);
@@ -249,6 +248,9 @@ class InstallableManager
   // The list of <params, callback> pairs that have come from a call to GetData.
   std::vector<Task> tasks_;
 
+  // Tasks which are waiting indefinitely for a service worker to be detected.
+  std::vector<Task> paused_tasks_;
+
   // Installable properties cached on this object.
   std::unique_ptr<ManifestProperty> manifest_;
   std::unique_ptr<ValidManifestProperty> valid_manifest_;