Add ExtensionsApiClient interface, use it in the storage API SettingsFrontend

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 20c4c715d4a0754ba9b41499369ac8729e560726..b89dcbb1a56a6cb1b1c02a0b997627549cd73c2f 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.cc
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.cc
@@ -27,6 +27,10 @@
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/pref_names.h"
 
+#if !defined(OS_ANDROID)
+#include "chrome/browser/extensions/api/chrome_extensions_api_client.h"
+#endif
+
 #if defined(OS_CHROMEOS)
 #include "chromeos/chromeos_switches.h"
 #endif
@@ -34,6 +38,9 @@
 namespace extensions {
 
 ChromeExtensionsBrowserClient::ChromeExtensionsBrowserClient() {
+#if !defined(OS_ANDROID)
+  api_client_.reset(new ChromeExtensionsAPIClient);
+#endif
   // Only set if it hasn't already been set (e.g. by a test).
   if (GetCurrentChannel() == GetDefaultChannel())
     SetCurrentChannel(chrome::VersionInfo::GetChannel());