Add ApiActivityMonitor to decouple ActivityLog from low-level extensions code

chrome/browser/extensions/chrome_extensions_browser_client.cc

Index: chrome/browser/extensions/chrome_extensions_browser_client.cc
diff --git a/chrome/browser/extensions/chrome_extensions_browser_client.cc b/chrome/browser/extensions/chrome_extensions_browser_client.cc
index e132a02a31abdb5ec3eefa9aece38efde5afb884..77727ce673e5cc6a8804f143857c302935506d22 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.cc
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.cc
@@ -8,6 +8,7 @@
 #include "base/version.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/extensions/activity_log/activity_log.h"
 #include "chrome/browser/extensions/chrome_app_sorting.h"
 #include "chrome/browser/extensions/extension_system_factory.h"
 #include "chrome/browser/profiles/profile.h"
@@ -168,6 +169,12 @@ ChromeExtensionsBrowserClient::GetJavaScriptDialogManager() {
   return GetJavaScriptDialogManagerInstance();
 }
 
+ApiActivityMonitor* ChromeExtensionsBrowserClient::GetApiActivityMonitor(
+    content::BrowserContext* context) {
+  // The ActivityLog monitors and records function calls and events.
+  return ActivityLog::GetInstance(context);
+}
+
 std::vector<BrowserContextKeyedServiceFactory*>
 ChromeExtensionsBrowserClient::GetExtensionSystemDependencies() {
   std::vector<BrowserContextKeyedServiceFactory*> dependencies;