DevTools: Move usedHeapSize from TimelineEvent into counters.

LayoutTests/inspector/timeline/timeline-timer-expected.txt

Index: LayoutTests/inspector/timeline/timeline-timer-expected.txt
diff --git a/LayoutTests/inspector/timeline/timeline-timer-expected.txt b/LayoutTests/inspector/timeline/timeline-timer-expected.txt
index 94af01a558ec595fde7cf0b55ee209190f5daf25..daa6515579198cce9db4914276bea16a3bf4d9b3 100644
--- a/LayoutTests/inspector/timeline/timeline-timer-expected.txt
+++ b/LayoutTests/inspector/timeline/timeline-timer-expected.txt
@@ -12,7 +12,6 @@ TimerInstall Properties:
     stackTrace : <object>
     startTime : <number>
     type : "TimerInstall"
-    usedHeapSize : <number>
 }
 TimerInstall Properties:
 {
@@ -26,7 +25,6 @@ TimerInstall Properties:
     stackTrace : <object>
     startTime : <number>
     type : "TimerInstall"
-    usedHeapSize : <number>
 }
 TimerFire Properties:
 {
@@ -39,7 +37,6 @@ TimerFire Properties:
     frameId : <string>
     startTime : <number>
     type : "TimerFire"
-    usedHeapSize : <number>
 }
 TimerFire Properties:
 {
@@ -52,7 +49,6 @@ TimerFire Properties:
     frameId : <string>
     startTime : <number>
     type : "TimerFire"
-    usedHeapSize : <number>
 }
 TimerFire Properties:
 {
@@ -65,7 +61,6 @@ TimerFire Properties:
     frameId : <string>
     startTime : <number>
     type : "TimerFire"
-    usedHeapSize : <number>
 }
 TimerRemove Properties:
 {
@@ -77,7 +72,6 @@ TimerRemove Properties:
     stackTrace : <object>
     startTime : <number>
     type : "TimerRemove"
-    usedHeapSize : <number>
 }
 FunctionCall Properties:
 {
@@ -91,7 +85,6 @@ FunctionCall Properties:
     frameId : <string>
     startTime : <number>
     type : "FunctionCall"
-    usedHeapSize : <number>
 }
 FunctionCall Properties:
 {
@@ -105,7 +98,6 @@ FunctionCall Properties:
     frameId : <string>
     startTime : <number>
     type : "FunctionCall"
-    usedHeapSize : <number>
 }
 FunctionCall Properties:
 {
@@ -119,7 +111,6 @@ FunctionCall Properties:
     frameId : <string>
     startTime : <number>
     type : "FunctionCall"
-    usedHeapSize : <number>
 }
 FunctionCall Properties:
 {
@@ -133,7 +124,6 @@ FunctionCall Properties:
     frameId : <string>
     startTime : <number>
     type : "FunctionCall"
-    usedHeapSize : <number>
 }
 EvaluateScript Properties:
 {
@@ -147,6 +137,5 @@ EvaluateScript Properties:
     frameId : <string>
     startTime : <number>
     type : "EvaluateScript"
-    usedHeapSize : <number>
 }