[DevTools] Fix crash when runtime.evaluate is called with contextId = 0

third_party/WebKit/Source/platform/v8_inspector/V8InspectorSessionImpl.cpp

Index: third_party/WebKit/Source/platform/v8_inspector/V8InspectorSessionImpl.cpp
diff --git a/third_party/WebKit/Source/platform/v8_inspector/V8InspectorSessionImpl.cpp b/third_party/WebKit/Source/platform/v8_inspector/V8InspectorSessionImpl.cpp
index 70eeef743bccd7777126dc9be45455c501a263fe..c874469aa10353b37a8c08d40ff85908e9211d9d 100644
--- a/third_party/WebKit/Source/platform/v8_inspector/V8InspectorSessionImpl.cpp
+++ b/third_party/WebKit/Source/platform/v8_inspector/V8InspectorSessionImpl.cpp
@@ -89,9 +89,14 @@ void V8InspectorSessionImpl::discardInjectedScripts()
 
 InjectedScript* V8InspectorSessionImpl::findInjectedScript(ErrorString* errorString, int contextId)
 {
+    if (!contextId) {
+        *errorString = "Cannot find context with specified id";
+        return nullptr;
+    }
+
     const V8DebuggerImpl::ContextByIdMap* contexts = m_debugger->contextGroup(m_contextGroupId);
     if (!contexts || !contexts->contains(contextId)) {
-        *errorString = "Inspected frame has gone";
+        *errorString = "Cannot find context with specified id";
         return nullptr;
     }