Use default copy constructor for ComputedStyleBase.

third_party/WebKit/Source/build/scripts/templates/ComputedStyleBase.h.tmpl

Index: third_party/WebKit/Source/build/scripts/templates/ComputedStyleBase.h.tmpl
diff --git a/third_party/WebKit/Source/build/scripts/templates/ComputedStyleBase.h.tmpl b/third_party/WebKit/Source/build/scripts/templates/ComputedStyleBase.h.tmpl
index d711d814993adb9c9cab407a1e1adf010fcfac8b..1688e5a3006c6ac9c6a943bb3726ee6ba475e1cd 100644
--- a/third_party/WebKit/Source/build/scripts/templates/ComputedStyleBase.h.tmpl
+++ b/third_party/WebKit/Source/build/scripts/templates/ComputedStyleBase.h.tmpl
@@ -28,12 +28,6 @@ class CORE_EXPORT ComputedStyleBase {
   {% endfor %}
   {}
 
-  ALWAYS_INLINE ComputedStyleBase(const ComputedStyleBase& o) :

[meade_UTC10, 2017/03/10 04:09:11]

Are we sure all the members of ComputedStyleBase will always all have their own
copy constructors? If any one of them doesn't, the compiler won't generate
this...

But - that might become a compile error in that case, where it wouldn't here, so
¯\_(ツ)_/¯

[shend, 2017/03/10 05:54:52]

Hopefully that won't happen :P Anyway, if one of the members is noncopyable,
this code will fail too since we're just calling the copy ctors of each member
right? To handle noncopyable members, we'd have to teach the generator how to
copy special fields, which is quite yuck.

-  {% for field in fields %}
-      {{field.name}}(o.{{field.name}}){{print_if(not loop.last, ',')}}
-  {% endfor %}
-  {}
-
   inline bool inheritedEqual(const ComputedStyleBase& o) const {
     return (
     {% for field in fields if field.is_property and field.is_inherited %}