[WIP] Attempt to move everything cssom into a cssom namespace

third_party/WebKit/Source/core/css/cssom/StylePropertyMap.h

Index: third_party/WebKit/Source/core/css/cssom/StylePropertyMap.h
diff --git a/third_party/WebKit/Source/core/css/cssom/StylePropertyMap.h b/third_party/WebKit/Source/core/css/cssom/StylePropertyMap.h
index a818dcbdd01e3c60f10f3f7461e5f51fe6ff3b58..127dbe34a5a49397c53656a70b754af31516a1b3 100644
--- a/third_party/WebKit/Source/core/css/cssom/StylePropertyMap.h
+++ b/third_party/WebKit/Source/core/css/cssom/StylePropertyMap.h
@@ -14,6 +14,7 @@
 #include "core/css/cssom/CSSStyleValue.h"
 
 namespace blink {
+namespace cssom {
 
 class ExceptionState;
 
@@ -53,6 +54,8 @@ protected:
     IterationSource* startIteration(ScriptState*, ExceptionState&) override;
 };
 
+} // namespace cssom
 } // namespace blink
 
+
 #endif