small misspelling fixes.

test/cctest/test-debug.cc

Index: test/cctest/test-debug.cc
===================================================================
--- test/cctest/test-debug.cc	(revision 14601)
+++ test/cctest/test-debug.cc	(working copy)
@@ -4248,7 +4248,7 @@
     v8::Persistent<v8::Context> context = v8::Context::New(&extensions);
     context.Dispose(context->GetIsolate());
   }
-  // Check that no DebugBreak events occured during the context creation.
+  // Check that no DebugBreak events occurred during the context creation.
   CHECK_EQ(0, break_point_hit_count);
 
   // Get rid of the debug event listener.
@@ -4765,7 +4765,7 @@
 }
 
 
-// We match the message wether it is an evaluate response message.
+// We match the message whether it is an evaluate response message.
 bool IsEvaluateResponseMessage(char* message) {
   const char* type_response = "\"type\":\"response\"";
   const char* command_evaluate = "\"command\":\"evaluate\"";
@@ -6398,7 +6398,7 @@
                                         frame_function_name_source,
                                         "frame_function_name");
 
-  // Test RegExp which matches white spaces and comments at the begining of a
+  // Test RegExp which matches white spaces and comments at the beginning of a
   // source line.
   const char* script =
     "var sourceLineBeginningSkip = /^(?:[ \\v\\h]*(?:\\/\\*.*?\\*\\/)*)*/;\n"
@@ -7077,7 +7077,7 @@
   CHECK_EQ(expected_callback_data, details.GetCallbackData());
 }
 
-// Check that event details contain context where debug event occured.
+// Check that event details contain context where debug event occurred.
 TEST(DebugEventContext) {
   v8::HandleScope scope(v8::Isolate::GetCurrent());
   expected_callback_data = v8::Int32::New(2010);
@@ -7107,7 +7107,7 @@
 }
 
 
-// Check that event details contain context where debug event occured.
+// Check that event details contain context where debug event occurred.
 TEST(DebugEventBreakData) {
   DebugLocalContext env;
   v8::HandleScope scope(env->GetIsolate());