Remove iframe@seamless

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index 5fced74a6cef13722d53860fc67b4800d8797fdd..330539b9069115fdfa18d254f314829cfc1c64eb 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -595,11 +595,7 @@ void FrameView::calculateScrollbarModesForLayout(ScrollbarMode& hMode, Scrollbar
 
     if (m_canHaveScrollbars || strategy == RulesFromWebContentOnly) {
         hMode = ScrollbarAuto;
-        // Seamless documents begin with heights of 0; we special case that here
-        // to correctly render documents that don't need scrollbars.
-        IntSize fullVisibleSize = visibleContentRect(IncludeScrollbars).size();
-        bool isSeamlessDocument = frame().document() && frame().document()->shouldDisplaySeamlesslyWithParent();
-        vMode = (isSeamlessDocument && !fullVisibleSize.height()) ? ScrollbarAlwaysOff : ScrollbarAuto;
+        vMode = ScrollbarAuto;
     } else {
         hMode = ScrollbarAlwaysOff;
         vMode = ScrollbarAlwaysOff;
@@ -785,7 +781,7 @@ void FrameView::performPreLayoutTasks()
     // Don't schedule more layouts, we're in one.
     TemporaryChange<bool> changeSchedulingEnabled(m_layoutSchedulingEnabled, false);
 
-    if (!m_nestedLayoutCount && !m_inSynchronousPostLayout && m_postLayoutTasksTimer.isActive() && !frame().document()->shouldDisplaySeamlesslyWithParent()) {
+    if (!m_nestedLayoutCount && !m_inSynchronousPostLayout && m_postLayoutTasksTimer.isActive()) {
         // This is a new top-level layout. If there are any remaining tasks from the previous layout, finish them now.
         m_inSynchronousPostLayout = true;
         performPostLayoutTasks();
@@ -871,17 +867,13 @@ void FrameView::scheduleOrPerformPostLayoutTasks()
     ASSERT(!(m_inSynchronousPostLayout && partialLayout().isStopping()));
 
     if (!m_inSynchronousPostLayout) {
-        if (frame().document()->shouldDisplaySeamlesslyWithParent()) {
-            updateWidgetPositions();
-        } else {
-            m_inSynchronousPostLayout = true;
-            // Calls resumeScheduledEvents()
-            performPostLayoutTasks();
-            m_inSynchronousPostLayout = false;
-        }
+        m_inSynchronousPostLayout = true;
+        // Calls resumeScheduledEvents()
+        performPostLayoutTasks();
+        m_inSynchronousPostLayout = false;
     }
 
-    if (!m_postLayoutTasksTimer.isActive() && (needsLayout() || m_inSynchronousPostLayout || frame().document()->shouldDisplaySeamlesslyWithParent())) {
+    if (!m_postLayoutTasksTimer.isActive() && (needsLayout() || m_inSynchronousPostLayout)) {
         // If we need layout or are already in a synchronous call to postLayoutTasks(),
         // defer widget updates and event dispatch until after we return. postLayoutTasks()
         // can make us need to update again, and we can get stuck in a nasty cycle unless
@@ -1789,11 +1781,6 @@ void FrameView::scheduleRelayout()
         return;
     InspectorInstrumentation::didInvalidateLayout(m_frame.get());
 
-    // When frame seamless is enabled, the contents of the frame could affect the layout of the parent frames.
-    // Also invalidate parent frame starting from the owner element of this frame.
-    if (m_frame->ownerRenderer() && m_frame->document()->shouldDisplaySeamlesslyWithParent())
-        m_frame->ownerRenderer()->setNeedsLayout();
-
     int delay = m_frame->document()->minimumLayoutDelay();
     if (m_layoutTimer.isActive() && m_delayedLayout && !delay)
         unscheduleRelayout();
@@ -2809,8 +2796,6 @@ void FrameView::updateLayoutAndStyleIfNeededRecursive()
     for (Vector<RefPtr<FrameView> >::iterator it = frameViews.begin(); it != end; ++it)
         (*it)->updateLayoutAndStyleIfNeededRecursive();
 
-    // When seamless is on, child frame can mark parent frame dirty. In such case, child frame
-    // needs to call layout on parent frame recursively.
     // This assert ensures that parent frames are clean, when child frames finished updating layout and style.
     ASSERT(!needsLayout());
 }