Add a SafeSearch preference, policy and implementation.

chrome/browser/net/chrome_network_delegate.h

Index: chrome/browser/net/chrome_network_delegate.h
diff --git a/chrome/browser/net/chrome_network_delegate.h b/chrome/browser/net/chrome_network_delegate.h
index 0913b7138ec896dacbc781fa035c7a13ab91ff91..0001291abe8329c53d5716757b0238009adfa16a 100644
--- a/chrome/browser/net/chrome_network_delegate.h
+++ b/chrome/browser/net/chrome_network_delegate.h
@@ -5,10 +5,14 @@
 #ifndef CHROME_BROWSER_NET_CHROME_NETWORK_DELEGATE_H_
 #define CHROME_BROWSER_NET_CHROME_NETWORK_DELEGATE_H_
 
+#include <set>
+#include <string>
+
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "net/base/network_delegate.h"
+#include "net/url_request/url_request.h"
 
 class CookieSettings;
 class ExtensionInfoMap;
@@ -50,6 +54,7 @@ class ChromeNetworkDelegate : public net::NetworkDelegate {
       CookieSettings* cookie_settings,
       BooleanPrefMember* enable_referrers,
       BooleanPrefMember* enable_do_not_track,
+      BooleanPrefMember* force_google_safesearch,
       chrome_browser_net::LoadTimeStats* load_time_stats);
   virtual ~ChromeNetworkDelegate();
 
@@ -60,14 +65,21 @@ class ChromeNetworkDelegate : public net::NetworkDelegate {
   // Binds the pref members to |pref_service| and moves them to the IO thread.
   // |enable_do_not_track| can be NULL.
   // This method should be called on the UI thread.
-  static void InitializePrefsOnUIThread(BooleanPrefMember* enable_referrers,
-                                        BooleanPrefMember* enable_do_not_track,
-                                        PrefService* pref_service);
+  static void InitializePrefsOnUIThread(
+      BooleanPrefMember* enable_referrers,
+      BooleanPrefMember* enable_do_not_track,
+      BooleanPrefMember* force_google_safesearch,
+      PrefService* pref_service);
 
   // When called, all file:// URLs will now be accessible.  If this is not
   // called, then some platforms restrict access to file:// paths.
   static void AllowAccessToAllFiles();
 
+  // Checks whether a request url should be overwritten with the SafeSearch
+  // parameters.
+  static void ForceGoogleSafeSearch(net::URLRequest* old_request,
+                                    GURL* new_url);
+
  private:
   friend class ChromeNetworkDelegateTest;
 
@@ -124,6 +136,7 @@ class ChromeNetworkDelegate : public net::NetworkDelegate {
   // Weak, owned by our owner.
   BooleanPrefMember* enable_referrers_;
   BooleanPrefMember* enable_do_not_track_;
+  BooleanPrefMember* force_google_safesearch_;
 
   // Weak, owned by our owner.
   const policy::URLBlacklistManager* url_blacklist_manager_;