PlzNavigate: Enforce 'frame-src' CSP on the browser.

third_party/WebKit/Source/core/loader/FrameLoader.cpp

Index: third_party/WebKit/Source/core/loader/FrameLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/FrameLoader.cpp b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
index 8011ff126505feb44dd3b6a058acddd9bf8e391f..f5b8cec3ad254910ff5fef0ad3b96457ccc92fef 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/FrameLoader.cpp
@@ -1660,11 +1660,20 @@ NavigationPolicy FrameLoader::shouldContinueForNavigationPolicy(
   if (request.url().isEmpty() || substituteData.isValid())
     return NavigationPolicyCurrentTab;
 
+  Settings* settings = m_frame->settings();
+  bool browserSideNavigationEnabled =
+      settings && settings->getBrowserSideNavigationEnabled();
+
   // If we're loading content into |m_frame| (NavigationPolicyCurrentTab), check
   // against the parent's Content Security Policy and kill the load if that
   // check fails, unless we should bypass the main world's CSP.
   if (policy == NavigationPolicyCurrentTab &&
-      shouldCheckMainWorldContentSecurityPolicy == CheckContentSecurityPolicy) {
+      shouldCheckMainWorldContentSecurityPolicy == CheckContentSecurityPolicy &&
+      // TODO(arthursonzogni): 'frame-src' check is disabled on the
+      // renderer side with browser-side-navigation, but is enforced on the
+      // browser side. See http://crbug.com/692595 for understanding why it
+      // can't be enforced on both sides instead.
+      !browserSideNavigationEnabled) {
     Frame* parentFrame = m_frame->tree().parent();
     if (parentFrame) {
       ContentSecurityPolicy* parentPolicy =
@@ -1691,9 +1700,9 @@ NavigationPolicy FrameLoader::shouldContinueForNavigationPolicy(
 
   bool replacesCurrentHistoryItem =
       frameLoadType == FrameLoadTypeReplaceCurrentItem;
-  policy = client()->decidePolicyForNavigation(request, loader, type, policy,
-                                               replacesCurrentHistoryItem,
-                                               isClientRedirect, form);
+  policy = client()->decidePolicyForNavigation(
+      request, loader, type, policy, replacesCurrentHistoryItem,
+      isClientRedirect, form, shouldCheckMainWorldContentSecurityPolicy);
   if (policy == NavigationPolicyCurrentTab ||
       policy == NavigationPolicyIgnore ||
       policy == NavigationPolicyHandledByClient ||