Audited and renamed uses of methods and variables named RootView

Source/platform/HostWindow.h

Index: Source/platform/HostWindow.h
diff --git a/Source/platform/HostWindow.h b/Source/platform/HostWindow.h
index 61050f6cd2c278d8ac80117e4a726a9d6f167673..09f1c7cfaa8dd671c82cd25526c1930eae2b6d4b 100644
--- a/Source/platform/HostWindow.h
+++ b/Source/platform/HostWindow.h
@@ -43,8 +43,8 @@ public:
     // Requests the host invalidate the contents.
     virtual void invalidateRect(const IntRect& updateRect) = 0;
 
-    // Methods for doing coordinate conversions to screen coordinates.
-    virtual IntRect rootViewToScreen(const IntRect&) const = 0;
+    // Converts from the window coordinates to screen coordinates.
+    virtual IntRect viewportToScreen(const IntRect&) const = 0;
 
     virtual WebScreenInfo screenInfo() const = 0;