Avoid explicit empty string initializations.

They already start out empty by default.

Change-Id: Iccfab99f6591753b91c08fbdc1d5edc13b1fa1c5
Reviewed-on: https://chromium-review.googlesource.com/c/1335280Reviewed-by: David Jacobo <djacobo@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608221}

chrome/browser/ui/find_bar/find_bar_platform_helper_mac_interactive_uitest.mm

@@ -58,7 +58,7 @@ IN_PROC_BROWSER_TEST_F(FindBarPlatformHelperMacInteractiveUITest,
   FindBarController* find_bar_controller = browser()->GetFindBarController();
   ASSERT_NE(nullptr, find_bar_controller);
 
-  base::string16 empty_string(base::ASCIIToUTF16(""));
+  const base::string16 empty_string;
   find_bar_controller->SetText(empty_string);
 
   chrome::Find(browser());
@@ -90,7 +90,7 @@ IN_PROC_BROWSER_TEST_F(FindBarPlatformHelperMacInteractiveUITest,
       browser_incognito->GetFindBarController();
   ASSERT_NE(nullptr, find_bar_controller);
 
-  base::string16 empty_string(base::ASCIIToUTF16(""));
+  const base::string16 empty_string;
   find_bar_controller->SetText(empty_string);
 
   chrome::Find(browser_incognito);
@@ -130,7 +130,7 @@ IN_PROC_BROWSER_TEST_F(FindBarPlatformHelperMacInteractiveUITest,
   GURL url = GetURL(kSimple);
   ui_test_utils::NavigateToURL(browser(), url);
 
-  base::string16 empty_string(base::ASCIIToUTF16(""));
+  const base::string16 empty_string;
   find_bar_controller->SetText(empty_string);
 
   chrome::Find(browser());
@@ -221,7 +221,7 @@ IN_PROC_BROWSER_TEST_F(FindBarPlatformHelperMacInteractiveUITest,
   content::WebContents* first_active_web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
 
-  base::string16 empty_string(base::ASCIIToUTF16(""));
+  const base::string16 empty_string;
   find_bar_controller->SetText(empty_string);
 
   chrome::Find(browser());

components/arc/intent_helper/arc_intent_helper_bridge_unittest.cc

@@ -461,7 +461,7 @@ TEST_F(ArcIntentHelperTest, TestAppendStringToIntentHelperPackageName) {
                 fake_activity),
             package_name + "." + fake_activity);
 
-  std::string empty_string = "";
+  const std::string empty_string;
   EXPECT_EQ(ArcIntentHelperBridge::AppendStringToIntentHelperPackageName(
                 empty_string),
             package_name + ".");