Update IDL to 1847

core/inspector/InspectorFrontendHost.idl

Index: core/inspector/InspectorFrontendHost.idl
diff --git a/core/inspector/InspectorFrontendHost.idl b/core/inspector/InspectorFrontendHost.idl
index 467e7aa563e4807429c52605f1ddbb71095bcd6e..a9102bc8a830b33c13c1129b98bbd833b2723c20 100644
--- a/core/inspector/InspectorFrontendHost.idl
+++ b/core/inspector/InspectorFrontendHost.idl
@@ -33,7 +33,9 @@
 [
     NoInterfaceObject
 ] interface InspectorFrontendHost {
+    // FIXME: setZoomFactor is here only for old frontends. Remove in M38.
     void setZoomFactor(float zoom);
+    float zoomFactor();
     void inspectedURLChanged(DOMString newURL);
 
     void setInjectedScriptForOrigin(DOMString origin, DOMString script);
@@ -53,8 +55,5 @@
     DOMString getSelectionBackgroundColor();
     DOMString getSelectionForegroundColor();
 
-    DOMFileSystem isolatedFileSystem(DOMString fileSystemId, DOMString registeredName);
-    void upgradeDraggedFileSystemPermissions(DOMFileSystem domFileSystem);
-
     boolean isUnderTest();
 };