Remove the backspace/shift+backspace navigating the page.

chrome/browser/ui/views/frame/browser_view.cc

Index: chrome/browser/ui/views/frame/browser_view.cc
diff --git a/chrome/browser/ui/views/frame/browser_view.cc b/chrome/browser/ui/views/frame/browser_view.cc
index fe8c83ef5cc8235e1cb3d251bbbdb321ce54450e..31d60e9faf16c5f73cc6ddc9d048b4e71141069e 100644
--- a/chrome/browser/ui/views/frame/browser_view.cc
+++ b/chrome/browser/ui/views/frame/browser_view.cc
@@ -2442,17 +2442,13 @@ void BrowserView::UpdateAcceleratorMetrics(const ui::Accelerator& accelerator,
   // on Chrome OS.
   switch (command_id) {
     case IDC_BACK:
-      if (key_code == ui::VKEY_BACK)
-        content::RecordAction(UserMetricsAction("Accel_Back_Backspace"));
-      else if (key_code == ui::VKEY_BROWSER_BACK)
+      if (key_code == ui::VKEY_BROWSER_BACK)
         content::RecordAction(UserMetricsAction("Accel_Back_F1"));
       else if (key_code == ui::VKEY_LEFT)
         content::RecordAction(UserMetricsAction("Accel_Back_Left"));
       break;
     case IDC_FORWARD:
-      if (key_code == ui::VKEY_BACK)
-        content::RecordAction(UserMetricsAction("Accel_Forward_Backspace"));
-      else if (key_code == ui::VKEY_BROWSER_FORWARD)
+      if (key_code == ui::VKEY_BROWSER_FORWARD)
         content::RecordAction(UserMetricsAction("Accel_Forward_F2"));
       else if (key_code == ui::VKEY_RIGHT)
         content::RecordAction(UserMetricsAction("Accel_Forward_Right"));