Remove CSS Custom Filters related code in TestRunner because the feature is gone in Blink.

Review URL: https://codereview.chromium.org/132473005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244303 0039d316-1c4b-4281-b951-d872f2087c98

content/shell/common/test_runner/WebPreferences.cpp

@@ -48,7 +48,6 @@ void WebPreferences::reset()
 
     tabsToLinks = false;
     hyperlinkAuditingEnabled = false;
-    cssCustomFilterEnabled = false;
     shouldRespectImageOrientation = false;
     asynchronousSpellCheckingEnabled = false;
 }

content/shell/common/test_runner/WebPreferences.h

@@ -41,7 +41,6 @@ struct WebPreferences {
     bool tabsToLinks;
     bool hyperlinkAuditingEnabled;
     bool caretBrowsingEnabled;
-    bool cssCustomFilterEnabled;
     bool shouldRespectImageOrientation;
     bool asynchronousSpellCheckingEnabled;
 

content/shell/renderer/test_runner/TestRunner.cpp

@@ -1686,8 +1686,6 @@ void TestRunner::overridePreference(const CppArgumentList& arguments, CppVariant
         prefs->allowDisplayOfInsecureContent = cppVariantToBool(value);
     else if (key == "WebKitAllowRunningInsecureContent")
         prefs->allowRunningOfInsecureContent = cppVariantToBool(value);
-    else if (key == "WebKitCSSCustomFilterEnabled")
-        prefs->cssCustomFilterEnabled = cppVariantToBool(value);
     else if (key == "WebKitShouldRespectImageOrientation")
         prefs->shouldRespectImageOrientation = cppVariantToBool(value);
     else if (key == "WebKitWebAudioEnabled")