Fix a variety of service protocol bugs.

runtime/vm/unit_test.cc

Index: runtime/vm/unit_test.cc
diff --git a/runtime/vm/unit_test.cc b/runtime/vm/unit_test.cc
index 421bbdcabc4444d2d9d233ad169b270a9f9a4598..969452759a1ad5ac821be0634ea7a1ad61dd0c8d 100644
--- a/runtime/vm/unit_test.cc
+++ b/runtime/vm/unit_test.cc
@@ -282,4 +282,24 @@ bool CompilerTest::TestCompileFunction(const Function& function) {
 }
 
 
+void ElideJSONSubstring(const char* prefix, const char* in, char* out) {
+  const char* pos = strstr(in, prefix);
+  while (pos != NULL) {
+    // Copy up to pos into the output buffer.
+    while (in < pos) {
+      *out++ = *in++;
+    }
+
+    // Skip to the close quote.
+    in += strcspn(in, "\"");
+    pos = strstr(in, prefix);
+  }
+  // Copy the remainder of in to out.
+  while (*in != '\0') {
+    *out++ = *in++;
+  }
+  *out = '\0';
+}
+
+
 }  // namespace dart