Rename 'UseCounter::observe' to 'UseCounter::count'.

Source/core/rendering/RenderDeprecatedFlexibleBox.cpp

Index: Source/core/rendering/RenderDeprecatedFlexibleBox.cpp
diff --git a/Source/core/rendering/RenderDeprecatedFlexibleBox.cpp b/Source/core/rendering/RenderDeprecatedFlexibleBox.cpp
index 2c8765523133c6934b6f33f118872173f3fc631b..248a192a96093f3f4bbe9d391a06195e03d18a9e 100644
--- a/Source/core/rendering/RenderDeprecatedFlexibleBox.cpp
+++ b/Source/core/rendering/RenderDeprecatedFlexibleBox.cpp
@@ -128,11 +128,11 @@ RenderDeprecatedFlexibleBox::RenderDeprecatedFlexibleBox(Element* element)
     if (!isAnonymous()) {
         const KURL& url = document()->url();
         if (url.protocolIs("chrome"))
-            UseCounter::observe(document(), UseCounter::DeprecatedFlexboxChrome);
+            UseCounter::count(document(), UseCounter::DeprecatedFlexboxChrome);
         else if (url.protocolIs("chrome-extension"))
-            UseCounter::observe(document(), UseCounter::DeprecatedFlexboxChromeExtension);
+            UseCounter::count(document(), UseCounter::DeprecatedFlexboxChromeExtension);
         else
-            UseCounter::observe(document(), UseCounter::DeprecatedFlexboxWebContent);
+            UseCounter::count(document(), UseCounter::DeprecatedFlexboxWebContent);
     }
 }