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

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

Index: third_party/WebKit/Source/core/css/cssom/ImmutableStylePropertyMap.h
diff --git a/third_party/WebKit/Source/core/css/cssom/ImmutableStylePropertyMap.h b/third_party/WebKit/Source/core/css/cssom/ImmutableStylePropertyMap.h
index f4f75fd16c8e0409bf87767789e1eab0f39b1838..cdb0641134fef840d1dee473c7f2674490086be6 100644
--- a/third_party/WebKit/Source/core/css/cssom/ImmutableStylePropertyMap.h
+++ b/third_party/WebKit/Source/core/css/cssom/ImmutableStylePropertyMap.h
@@ -8,6 +8,7 @@
 #include "core/css/cssom/StylePropertyMap.h"
 
 namespace blink {
+namespace cssom {
 
 class CORE_EXPORT ImmutableStylePropertyMap : public StylePropertyMap {
     WTF_MAKE_NONCOPYABLE(ImmutableStylePropertyMap);
@@ -31,6 +32,8 @@ protected:
     ImmutableStylePropertyMap() = default;
 };
 
+} // namespace cssom
 } // namespace blink
 
+
 #endif