[inspector] Make InspectorTest.sendCommand* private

test/inspector/debugger/set-breakpoint-before-enabling.js

Index: test/inspector/debugger/set-breakpoint-before-enabling.js
diff --git a/test/inspector/debugger/set-breakpoint-before-enabling.js b/test/inspector/debugger/set-breakpoint-before-enabling.js
index d905847b59d7a7068615d8b0f2a6de77835eeff2..8480aa6f75d6691672222dfaa1783c9e543bd60d 100644
--- a/test/inspector/debugger/set-breakpoint-before-enabling.js
+++ b/test/inspector/debugger/set-breakpoint-before-enabling.js
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-InspectorTest.sendCommand("Debugger.setBreakpointByUrl", { url: "http://example.com", lineNumber: 10  }, didSetBreakpointByUrlBeforeEnable);
+Protocol.Debugger.setBreakpointByUrl({ url: "http://example.com", lineNumber: 10  }).then(didSetBreakpointByUrlBeforeEnable);
 
 function didSetBreakpointByUrlBeforeEnable(message)
 {
   InspectorTest.log("setBreakpointByUrl error: " + JSON.stringify(message.error, null, 2));
-  InspectorTest.sendCommand("Debugger.setBreakpoint", {}, didSetBreakpointBeforeEnable);
+  Protocol.Debugger.setBreakpoint().then(didSetBreakpointBeforeEnable);
 }
 
 function didSetBreakpointBeforeEnable(message)