Adding a DownloadRestrictions group policy.

content/browser/download/download_item_impl.cc

Index: content/browser/download/download_item_impl.cc
diff --git a/content/browser/download/download_item_impl.cc b/content/browser/download/download_item_impl.cc
index 47ad0ee6944fc98bafb52c0621adf81b0e10e239..acf58c8ed6626851323247e4282fadc4993df473 100644
--- a/content/browser/download/download_item_impl.cc
+++ b/content/browser/download/download_item_impl.cc
@@ -596,11 +596,11 @@ std::string DownloadItemImpl::GetRemoteAddress() const {
 
 bool DownloadItemImpl::HasUserGesture() const {
   return has_user_gesture_;
-};
+}
 
 ui::PageTransition DownloadItemImpl::GetTransitionType() const {
   return transition_type_;
-};
+}
 
 const std::string& DownloadItemImpl::GetLastModifiedTime() const {
   return last_modified_time_;
@@ -777,7 +777,8 @@ WebContents* DownloadItemImpl::GetWebContents() const {
   return NULL;
 }
 
-void DownloadItemImpl::OnContentCheckCompleted(DownloadDangerType danger_type) {
+void DownloadItemImpl::OnContentCheckCompleted(DownloadDangerType danger_type,
+                                               bool block_file) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DCHECK(AllDataSaved());
 
@@ -791,6 +792,8 @@ void DownloadItemImpl::OnContentCheckCompleted(DownloadDangerType danger_type) {
   DVLOG(20) << __func__ << "() danger_type=" << danger_type
             << " download=" << DebugString(true);
   SetDangerType(danger_type);
+  if (block_file)
+    InterruptAndDiscardPartialState(DOWNLOAD_INTERRUPT_REASON_FILE_BLOCKED);
   UpdateObservers();
 }
 
@@ -881,7 +884,7 @@ DownloadItemImpl::ResumeMode DownloadItemImpl::GetResumeMode() const {
   bool user_action_required =
       (auto_resume_count_ >= kMaxAutoResumeAttempts || is_paused_);
 
-  switch(last_reason_) {
+  switch (last_reason_) {
     case DOWNLOAD_INTERRUPT_REASON_FILE_TRANSIENT_ERROR:
     case DOWNLOAD_INTERRUPT_REASON_NETWORK_TIMEOUT:
       break;
@@ -2104,7 +2107,7 @@ const char* DownloadItemImpl::DebugDownloadStateString(
       return "RESUMING";
     case MAX_DOWNLOAD_INTERNAL_STATE:
       break;
-  };
+  }
   NOTREACHED() << "Unknown download state " << state;
   return "unknown";
 }