Escape backslash (\x5C) for string value of search query.

chrome/browser/google_apis/drive_api_util.cc

Index: chrome/browser/google_apis/drive_api_util.cc
diff --git a/chrome/browser/google_apis/drive_api_util.cc b/chrome/browser/google_apis/drive_api_util.cc
index 10597c3c7e5fe870bcee90b711ba50f4555fc93f..51700f382c3dd15ace72f29cffeeead8ab1d600d 100644
--- a/chrome/browser/google_apis/drive_api_util.cc
+++ b/chrome/browser/google_apis/drive_api_util.cc
@@ -23,7 +23,13 @@ namespace util {
 
 std::string EscapeQueryStringValue(const std::string& str) {
   std::string result;
-  ReplaceChars(str, "'", "\\'", &result);
+  result.reserve(str.size());
+  for (size_t i = 0; i < str.size(); ++i) {
+    if (str[i] == '\\' || str[i] == '\'') {
+      result.push_back('\\');
+    }
+    result.push_back(str[i]);
+  }
   return result;
 }