Simplify whitespace handling in build/ Jinja templates

Source/build/scripts/templates/EventFactory.cpp.tmpl

Index: Source/build/scripts/templates/EventFactory.cpp.tmpl
diff --git a/Source/build/scripts/templates/EventFactory.cpp.tmpl b/Source/build/scripts/templates/EventFactory.cpp.tmpl
index 1b9bd3394d0f7f09cce9826dbb6424ad7e4160a0..d250fc11443ce3026e3c8313995fb1cd90c2a04e 100644
--- a/Source/build/scripts/templates/EventFactory.cpp.tmpl
+++ b/Source/build/scripts/templates/EventFactory.cpp.tmpl
@@ -1,4 +1,4 @@
-{% from "macros.tmpl" import wrap_with_condition, license -%}
+{% from "macros.tmpl" import wrap_with_condition, license %}
 {{ license() }}
 
 #include "config.h"
@@ -11,12 +11,12 @@ namespace WebCore {
 
 PassRefPtrWillBeRawPtr<{{namespace}}> {{namespace}}Factory::create(const String& type)
 {
-{%- for event in events %}
-{%- call wrap_with_condition(event.Conditional) %}
+    {% for event in events %}
+    {% call wrap_with_condition(event.Conditional) %}
     if (type == "{{event|script_name}}"{% if event.RuntimeEnabled %} && RuntimeEnabledFeatures::{{event.RuntimeEnabled|lower_first}}(){% endif %})
         return {{event|cpp_name}}::create();
-{%- endcall %}
-{%- endfor %}
+    {% endcall %}
+    {% endfor %}
     return nullptr;
 }