Bug 610077. Drop the default timeout clamp to 4ms. r=jst

dom/base/nsGlobalWindow.cpp

@@ -274,7 +274,7 @@ static PRBool               gDOMWindowDumpEnabled      = PR_FALSE;
 #endif
 
 // The default shortest interval/timeout we permit
-#define DEFAULT_MIN_TIMEOUT_VALUE 10 // 10ms
+#define DEFAULT_MIN_TIMEOUT_VALUE 4 // 4ms
 #define DEFAULT_MIN_BACKGROUND_TIMEOUT_VALUE 1000 // 1000ms
 static PRInt32 gMinTimeoutValue;
 static PRInt32 gMinBackgroundTimeoutValue;

modules/libpref/src/init/all.js

@@ -574,7 +574,7 @@ pref("dom.storage.default_quota",      5120);
 pref("dom.send_after_paint_to_content", false);
 
 // Timeout clamp in ms for timeouts we clamp
-pref("dom.min_timeout_value", 10);
+pref("dom.min_timeout_value", 4);
 // And for background windows
 pref("dom.min_background_timeout_value", 1000);