WebUI Tab Strip: Update handler to use newer base::ListValue APIs

Change-Id: If7dcc1d250162ac5bd315d163b4f49fc0aa16b61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2016352Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734706}

chrome/browser/ui/webui/tab_strip/tab_strip_ui_handler.cc

@@ -578,10 +578,8 @@ void TabStripUIHandler::HandleShowBackgroundContextMenu(
     const base::ListValue* args) {
   gfx::PointF point;
   {
-    double x = 0;
-    args->GetDouble(0, &x);
-    double y = 0;
-    args->GetDouble(1, &y);
+    double x = args->GetList()[0].GetDouble();
+    double y = args->GetList()[1].GetDouble();
     point = gfx::PointF(x, y);
   }
 
@@ -593,15 +591,12 @@ void TabStripUIHandler::HandleShowBackgroundContextMenu(
 }
 
 void TabStripUIHandler::HandleShowTabContextMenu(const base::ListValue* args) {
-  int tab_id = 0;
-  args->GetInteger(0, &tab_id);
+  int tab_id = args->GetList()[0].GetInt();
 
   gfx::PointF point;
   {
-    double x = 0;
-    args->GetDouble(1, &x);
-    double y = 0;
-    args->GetDouble(2, &y);
+    double x = args->GetList()[1].GetDouble();
+    double y = args->GetList()[2].GetDouble();
     point = gfx::PointF(x, y);
   }
 
@@ -631,10 +626,7 @@ void TabStripUIHandler::HandleGetLayout(const base::ListValue* args) {
 void TabStripUIHandler::HandleSetThumbnailTracked(const base::ListValue* args) {
   AllowJavascript();
 
-  int tab_id = 0;
-  if (!args->GetInteger(0, &tab_id))
-    return;
-
+  int tab_id = args->GetList()[0].GetInt();
   const bool thumbnail_tracked = args->GetList()[1].GetBool();
 
   content::WebContents* tab = nullptr;
@@ -653,28 +645,23 @@ void TabStripUIHandler::HandleSetThumbnailTracked(const base::ListValue* args) {
 
 void TabStripUIHandler::HandleReportTabActivationDuration(
     const base::ListValue* args) {
-  int duration_ms = 0;
-  args->GetInteger(0, &duration_ms);
+  int duration_ms = args->GetList()[0].GetInt();
   UMA_HISTOGRAM_TIMES("WebUITabStrip.TabActivation",
                       base::TimeDelta::FromMilliseconds(duration_ms));
 }
 
 void TabStripUIHandler::HandleReportTabDataReceivedDuration(
     const base::ListValue* args) {
-  int tab_count = 0;
-  args->GetInteger(0, &tab_count);
-  int duration_ms = 0;
-  args->GetInteger(1, &duration_ms);
+  int tab_count = args->GetList()[0].GetInt();
+  int duration_ms = args->GetList()[1].GetInt();
   ReportTabDurationHistogram("TabDataReceived", tab_count,
                              base::TimeDelta::FromMilliseconds(duration_ms));
 }
 
 void TabStripUIHandler::HandleReportTabCreationDuration(
     const base::ListValue* args) {
-  int tab_count = 0;
-  args->GetInteger(0, &tab_count);
-  int duration_ms = 0;
-  args->GetInteger(1, &duration_ms);
+  int tab_count = args->GetList()[0].GetInt();
+  int duration_ms = args->GetList()[1].GetInt();
   ReportTabDurationHistogram("TabCreation", tab_count,
                              base::TimeDelta::FromMilliseconds(duration_ms));
 }