Cleanup namespace usage in Source/web/.

Source/web/WebPluginScrollbarImpl.cpp

Index: Source/web/WebPluginScrollbarImpl.cpp
diff --git a/Source/web/WebPluginScrollbarImpl.cpp b/Source/web/WebPluginScrollbarImpl.cpp
index 46041f7e9693538ffde59cb7ea058e4a24b1c589..93358390ac76de9d632b2a946105093a8d4bbe7e 100644
--- a/Source/web/WebPluginScrollbarImpl.cpp
+++ b/Source/web/WebPluginScrollbarImpl.cpp
@@ -41,8 +41,6 @@
 #include "web/WebPluginContainerImpl.h"
 #include "web/WebViewImpl.h"
 
-using namespace blink;
-
 namespace blink {
 
 WebPluginScrollbar* WebPluginScrollbar::createForPlugin(Orientation orientation,
@@ -67,7 +65,7 @@ WebPluginScrollbarImpl::WebPluginScrollbarImpl(Orientation orientation,
 {
     m_scrollbar = Scrollbar::create(
         static_cast<ScrollableArea*>(m_group),
-        static_cast<blink::ScrollbarOrientation>(orientation),
+        static_cast<ScrollbarOrientation>(orientation),
         blink::RegularScrollbar);
     m_group->scrollbarCreated(this);
 }
@@ -183,7 +181,7 @@ WebScrollbar::ScrollbarOverlayStyle WebPluginScrollbarImpl::scrollbarOverlayStyl
 
 WebScrollbar::Orientation WebPluginScrollbarImpl::orientation() const
 {
-    if (m_scrollbar->orientation() == blink::HorizontalScrollbar)
+    if (m_scrollbar->orientation() == HorizontalScrollbar)
         return WebScrollbar::Horizontal;
     return WebScrollbar::Vertical;
 }