DevTools: [Console] fix search to reveal matched messages

LayoutTests/inspector/console/console-viewport-selection-expected.txt

Index: LayoutTests/inspector/console/console-viewport-selection-expected.txt
diff --git a/LayoutTests/inspector/console/console-viewport-selection-expected.txt b/LayoutTests/inspector/console/console-viewport-selection-expected.txt
index 889a55daf8d8d83edcb0f9df6951de89d6f39160..823cb635e724501a15ee4aa22c5bb31ca2362d95 100644
--- a/LayoutTests/inspector/console/console-viewport-selection-expected.txt
+++ b/LayoutTests/inspector/console/console-viewport-selection-expected.txt
@@ -172,7 +172,7 @@ EOL
 
 Running: testSimpleVisibleSelection
 anchor = {item: 72, offset: 6}, head = {item: 77, offset: 6}
-last visible message index: 78
+last visible message index: 77
 
 Running: testHalfScrollSelectionUp
 anchor = {item: 72, offset: 6}, head = {item: 77, offset: 6}
@@ -180,7 +180,7 @@ first visible message index: 74
 
 Running: testHalfScrollSelectionDown
 anchor = {item: 72, offset: 6}, head = {item: 77, offset: 6}
-last visible message index: 76
+last visible message index: 75
 
 Running: testScrollSelectionAwayUp
 anchor = {item: 72, offset: 6}, head = {item: 77, offset: 6}
@@ -204,7 +204,7 @@ last visible message index: 149
 
 Running: testReversedVisibleSelection
 anchor = {item: 76, offset: 6}, head = {item: 71, offset: 6}
-last visible message index: 77
+last visible message index: 76
 
 Running: testShiftClickReversedSelectionOver
 anchor = {item: 76, offset: 6}, head = {item: 10, offset: 0}