Audit the use of updateStyleAndLayoutIgnorePendingStylesheets in SearchBuffer.

third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp

Index: third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
diff --git a/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp b/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
index 4de8fdfe02df84ea7e30dec0b42d212158c8746c..fb62e50657718f5e44de270e0613d16c0c2f8421 100644
--- a/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
+++ b/third_party/WebKit/Source/core/editing/commands/EditorCommand.cpp
@@ -566,6 +566,10 @@ static bool executeDeleteWordForward(LocalFrame& frame, Event*, EditorCommandSou
 
 static bool executeFindString(LocalFrame& frame, Event*, EditorCommandSource, const String& value)
 {
+    DCHECK(frame.document());
+    // Up-to-date, clean tree is required for finding text in page, since it relies
+    // on TextIterator to look over the text.
+    frame.document()->updateStyleAndLayoutIgnorePendingStylesheets();
     return frame.editor().findString(value, CaseInsensitive | WrapAround);
 }