[Extensions] Add URLPattern move constructor/assignment

Add support for std::move()'ing URLPatterns around.

Bug: 908536

Change-Id: I2e9721a3a0bbd76c068c5346f0eac6b2d3dccf10
Reviewed-on: https://chromium-review.googlesource.com/c/1482134Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634779}

extensions/common/url_pattern.cc

@@ -176,9 +176,15 @@ URLPattern::URLPattern(int valid_schemes, base::StringPiece pattern)
 
 URLPattern::URLPattern(const URLPattern& other) = default;
 
+URLPattern::URLPattern(URLPattern&& other) = default;
+
 URLPattern::~URLPattern() {
 }
 
+URLPattern& URLPattern::operator=(const URLPattern& other) = default;
+
+URLPattern& URLPattern::operator=(URLPattern&& other) = default;
+
 bool URLPattern::operator<(const URLPattern& other) const {
   return GetAsString() < other.GetAsString();
 }

extensions/common/url_pattern.h

@@ -108,8 +108,12 @@ class URLPattern {
 
   URLPattern();
   URLPattern(const URLPattern& other);
+  URLPattern(URLPattern&& other);
   ~URLPattern();
 
+  URLPattern& operator=(const URLPattern& other);
+  URLPattern& operator=(URLPattern&& other);
+
   bool operator<(const URLPattern& other) const;
   bool operator>(const URLPattern& other) const;
   bool operator==(const URLPattern& other) const;