Add the ThirdPartyModules.Uninstallable histogram.

chrome/browser/conflicts/module_database_win.h

Index: chrome/browser/conflicts/module_database_win.h
diff --git a/chrome/browser/conflicts/module_database_win.h b/chrome/browser/conflicts/module_database_win.h
index 6d75733725cad5f24eb1c237a415d3489fac2de6..cf4ce5f42e476090f8d4d2b9c51293c297728d18 100644
--- a/chrome/browser/conflicts/module_database_win.h
+++ b/chrome/browser/conflicts/module_database_win.h
@@ -13,11 +13,15 @@
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
 #include "base/sequenced_task_runner.h"
 #include "chrome/browser/conflicts/module_info_win.h"
 #include "chrome/browser/conflicts/module_inspector_win.h"
+#include "chrome/browser/conflicts/third_party_metrics_recorder_win.h"
 #include "content/public/common/process_type.h"
 
+class ModuleDatabaseObserver;
+
 // A class that keeps track of all modules loaded across Chrome processes.
 // Drives the chrome://conflicts UI.
 //
@@ -88,6 +92,10 @@ class ModuleDatabase {
   // TODO(chrisha): Module analysis code, and various accessors for use by
   // chrome://conflicts.
 
+  // Adds or removes an observer.
+  void AddObserver(ModuleDatabaseObserver* observer);
+  void RemoveObserver(ModuleDatabaseObserver* observer);
+
  private:
   friend class TestModuleDatabase;
   friend class ModuleDatabaseTest;
@@ -161,6 +169,10 @@ class ModuleDatabase {
   // them.
   ProcessMap processes_;
 
+  base::ObserverList<ModuleDatabaseObserver> observer_list_;
+
+  ThirdPartyMetricsRecorder third_party_metrics_;
+
   // Weak pointer factory for this object. This is used when bouncing
   // incoming events to |task_runner_|.
   base::WeakPtrFactory<ModuleDatabase> weak_ptr_factory_;