Make "three snapshot technique" work on heap snapshots loaded from files

Source/devtools/front_end/CPUProfileView.js

Index: Source/devtools/front_end/CPUProfileView.js
diff --git a/Source/devtools/front_end/CPUProfileView.js b/Source/devtools/front_end/CPUProfileView.js
index 745dc84e5a2913aea19c50a7e0e4eb231ba644f4..81070446eb1b6fd378370c6c82812f761e3becdb 100644
--- a/Source/devtools/front_end/CPUProfileView.js
+++ b/Source/devtools/front_end/CPUProfileView.js
@@ -749,7 +749,7 @@ WebInspector.CPUProfileType.prototype = {
     removeProfile: function(profile)
     {
         WebInspector.ProfileType.prototype.removeProfile.call(this, profile);
-        if (!profile.isTemporary)
+        if (!profile.isTemporary && !profile.fromFile())
             ProfilerAgent.removeProfile(this.id, profile.uid);
     },
 
@@ -919,11 +919,10 @@ WebInspector.CPUProfileHeader.prototype = {
     },
 
     /**
-     * @param {File} file
+     * @param {!File} file
      */
     loadFromFile: function(file)
     {
-        this.title = file.name;
         this.sidebarElement.subtitle = WebInspector.UIString("Loading\u2026");
         this.sidebarElement.wait = true;