DevTools: Move usedHeapSize from TimelineEvent into counters.

LayoutTests/virtual/deferred/inspector/timeline/timeline-decode-resize-expected.txt

Index: LayoutTests/virtual/deferred/inspector/timeline/timeline-decode-resize-expected.txt
diff --git a/LayoutTests/virtual/deferred/inspector/timeline/timeline-decode-resize-expected.txt b/LayoutTests/virtual/deferred/inspector/timeline/timeline-decode-resize-expected.txt
index dbca3d8e72eb1fd614615a0c9b025cce92a411f6..50d3e08cf03c974be81abea0204fe8555fe3a8e0 100644
--- a/LayoutTests/virtual/deferred/inspector/timeline/timeline-decode-resize-expected.txt
+++ b/LayoutTests/virtual/deferred/inspector/timeline/timeline-decode-resize-expected.txt
@@ -13,7 +13,6 @@ DecodeImage Properties:
     endTime : <number>
     startTime : <number>
     type : "DecodeImage"
-    usedHeapSize : <number>
 }
 DecodeImage Properties:
 {
@@ -27,7 +26,6 @@ DecodeImage Properties:
     endTime : <number>
     startTime : <number>
     type : "DecodeImage"
-    usedHeapSize : <number>
 }
 DecodeImage Properties:
 {
@@ -41,7 +39,6 @@ DecodeImage Properties:
     endTime : <number>
     startTime : <number>
     type : "DecodeImage"
-    usedHeapSize : <number>
 }
 ResizeImage Properties:
 {
@@ -55,7 +52,6 @@ ResizeImage Properties:
     endTime : <number>
     startTime : <number>
     type : "ResizeImage"
-    usedHeapSize : <number>
 }
 DecodeImage Properties:
 {
@@ -69,7 +65,6 @@ DecodeImage Properties:
     endTime : <number>
     startTime : <number>
     type : "DecodeImage"
-    usedHeapSize : <number>
 }
 DecodeImage Properties:
 {
@@ -83,7 +78,6 @@ DecodeImage Properties:
     endTime : <number>
     startTime : <number>
     type : "DecodeImage"
-    usedHeapSize : <number>
 }
 DecodeImage Properties:
 {
@@ -97,7 +91,6 @@ DecodeImage Properties:
     endTime : <number>
     startTime : <number>
     type : "DecodeImage"
-    usedHeapSize : <number>
 }
 DecodeImage Properties:
 {
@@ -111,6 +104,5 @@ DecodeImage Properties:
     endTime : <number>
     startTime : <number>
     type : "DecodeImage"
-    usedHeapSize : <number>
 }