Use base::StartWith() in more places when appropriate.

chrome/browser/memory/tab_manager_delegate_chromeos.cc

Index: chrome/browser/memory/tab_manager_delegate_chromeos.cc
diff --git a/chrome/browser/memory/tab_manager_delegate_chromeos.cc b/chrome/browser/memory/tab_manager_delegate_chromeos.cc
index 482efe35c44111ba25b9837e121bd96f85e14e03..a6a3d167a926834064717082cc73020cc73fa48c 100644
--- a/chrome/browser/memory/tab_manager_delegate_chromeos.cc
+++ b/chrome/browser/memory/tab_manager_delegate_chromeos.cc
@@ -72,7 +72,8 @@ bool IsArcWindow(aura::Window* window) {
   if (!window || window->name() != kExoShellSurfaceWindowName)
     return false;
   std::string application_id = exo::ShellSurface::GetApplicationId(window);
-  return application_id.find(kArcProcessNamePrefix) == 0;
+  return base::StartsWith(application_id, kArcProcessNamePrefix,
+                          base::CompareCase::SENSITIVE);
 }
 
 bool IsArcWindowInForeground() {
@@ -284,15 +285,15 @@ int TabManagerDelegate::MemoryStat::EstimatedMemoryFreedKB(
 }
 
 class TabManagerDelegate::UmaReporter {
-  public:
-   UmaReporter()
-       : last_kill_time_(), total_kills_(0) {}
-   ~UmaReporter() {}
-   void ReportKill(const int memory_freed);
-
-  private:
-   base::Time last_kill_time_;
-   int total_kills_;
+ public:
+  UmaReporter() : total_kills_(0) {}
+  ~UmaReporter() {}
+
+  void ReportKill(const int memory_freed);
+
+ private:
+  base::Time last_kill_time_;
+  int total_kills_;
 };
 
 void TabManagerDelegate::UmaReporter::ReportKill(const int memory_freed) {