Moved ExtensionPrefs and related into extensions namespace

chrome/test/base/testing_profile.h

Index: chrome/test/base/testing_profile.h
diff --git a/chrome/test/base/testing_profile.h b/chrome/test/base/testing_profile.h
index 818eb5aa629375b297a8de4462d9c088e7bfa7ca..760f325f2322e13f7f88e2768ef75c00aa923191 100644
--- a/chrome/test/base/testing_profile.h
+++ b/chrome/test/base/testing_profile.h
@@ -18,6 +18,10 @@ namespace content {
 class MockResourceContext;
 }
 
+namespace extensions {
+class ExtensionPrefs;
+}
+
 namespace history {
 class TopSites;
 }
@@ -32,7 +36,6 @@ class SpecialStoragePolicy;
 }
 
 class CommandLine;
-class ExtensionPrefs;
 class ExtensionSpecialStoragePolicy;
 class FaviconService;
 class HostContentSettingsMap;