Cleanup namespace usage in Source/web/Web[I-Z]*.cpp

Source/web/WebPopupMenuImpl.cpp

Index: Source/web/WebPopupMenuImpl.cpp
diff --git a/Source/web/WebPopupMenuImpl.cpp b/Source/web/WebPopupMenuImpl.cpp
index 81908b0a35135c8e765643f694f6c7ddb1801f24..b769087e4c47b4cbdefd5b1ad0a2d858f1b42771 100644
--- a/Source/web/WebPopupMenuImpl.cpp
+++ b/Source/web/WebPopupMenuImpl.cpp
@@ -57,8 +57,6 @@
 #include "web/WebInputEventConversion.h"
 #include <skia/ext/platform_canvas.h>
 
-using namespace blink;
-
 namespace blink {
 
 // WebPopupMenu ---------------------------------------------------------------
@@ -121,7 +119,7 @@ void WebPopupMenuImpl::handleMouseMove(const WebMouseEvent& event)
 
         // We cannot call setToolTipText() in PopupContainer, because PopupContainer is in WebCore, and we cannot refer to WebKit from Webcore.
         PopupContainer* container = static_cast<PopupContainer*>(m_widget);
-        client()->setToolTipText(container->getSelectedItemToolTip(), container->menuStyle().textDirection() == blink::RTL ? WebTextDirectionRightToLeft : WebTextDirectionLeftToRight);
+        client()->setToolTipText(container->getSelectedItemToolTip(), container->menuStyle().textDirection() == RTL ? WebTextDirectionRightToLeft : WebTextDirectionLeftToRight);
     }
 }
 
@@ -367,7 +365,7 @@ void WebPopupMenuImpl::setTextDirection(WebTextDirection)
 
 
 //-----------------------------------------------------------------------------
-// blink::HostWindow
+// HostWindow
 
 void WebPopupMenuImpl::invalidateContentsAndRootView(const IntRect& paintRect)
 {
@@ -406,7 +404,7 @@ WebScreenInfo WebPopupMenuImpl::screenInfo() const
 }
 
 //-----------------------------------------------------------------------------
-// blink::FramelessScrollViewClient
+// FramelessScrollViewClient
 
 void WebPopupMenuImpl::popupClosed(FramelessScrollView* widget)
 {