Rename WebCore namespace to blink in Platform

Source/platform/PurgeableVector.cpp

Index: Source/platform/PurgeableVector.cpp
diff --git a/Source/platform/PurgeableVector.cpp b/Source/platform/PurgeableVector.cpp
index d3efe15687d03eb34f3f6ee9cb53a96ddc7a1109..2dcb4c5f9a4bb4a6c7d2c834c84a4adbf5c0b411 100644
--- a/Source/platform/PurgeableVector.cpp
+++ b/Source/platform/PurgeableVector.cpp
@@ -39,7 +39,7 @@
 
 #include <cstring>
 
-namespace WebCore {
+namespace blink {
 
 // WebDiscardableMemory allocations are expensive and page-grained. We only use
 // them when there's a reasonable amount of memory to be saved by the OS
@@ -259,4 +259,4 @@ size_t PurgeableVector::adjustPurgeableCapacity(size_t capacity) const
     return std::max(capacity, newCapacity); // Overflow check.
 }
 
-} // namespace WebCore
+} // namespace blink