Split initial methods of padding on ComputedStyle.

third_party/WebKit/Source/core/css/CSSProperties.json5

Index: third_party/WebKit/Source/core/css/CSSProperties.json5
diff --git a/third_party/WebKit/Source/core/css/CSSProperties.json5 b/third_party/WebKit/Source/core/css/CSSProperties.json5
index eccec5441e4e39a870d8440f0bff60e9bd0e457b..07577a8c4d27da0920fb093f02ad65a5a716f5e6 100644
--- a/third_party/WebKit/Source/core/css/CSSProperties.json5
+++ b/third_party/WebKit/Source/core/css/CSSProperties.json5
@@ -1511,7 +1511,6 @@
       api_class: "CSSPropertyAPIPadding",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLength",
-      initial: "InitialPadding",
       interpolable: true,
     },
     {
@@ -1519,7 +1518,6 @@
       api_class: "CSSPropertyAPIPadding",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLength",
-      initial: "InitialPadding",
       interpolable: true,
     },
     {
@@ -1527,7 +1525,6 @@
       api_class: "CSSPropertyAPIPadding",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLength",
-      initial: "InitialPadding",
       interpolable: true,
     },
     {
@@ -1535,7 +1532,6 @@
       api_class: "CSSPropertyAPIPadding",
       api_methods: ["parseSingleValue"],
       converter: "ConvertLength",
-      initial: "InitialPadding",
       interpolable: true,
     },
     {