more spell checking

BUG=none
NOTRY=true

Review URL: https://codereview.chromium.org/57463003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232902 0039d316-1c4b-4281-b951-d872f2087c98

base/threading/non_thread_safe.h

@@ -56,7 +56,7 @@ class NonThreadSafeDoNothing {
 // }
 //
 // Note that base::ThreadChecker offers identical functionality to
-// NonThreadSafe, but does not require inheritence. In general, it is preferable
+// NonThreadSafe, but does not require inheritance. In general, it is preferable
 // to have a base::ThreadChecker as a member, rather than inherit from
 // NonThreadSafe. For more details about when to choose one over the other, see
 // the documentation for base::ThreadChecker.

base/threading/thread_checker.h

@@ -46,7 +46,7 @@ class ThreadCheckerDoNothing {
 //
 // While inheriting from base::NonThreadSafe may give a clear indication about
 // the thread-safety of a class, it may also lead to violations of the style
-// guide with regard to multiple inheritence. The choice between having a
+// guide with regard to multiple inheritance. The choice between having a
 // ThreadChecker member and inheriting from base::NonThreadSafe should be based
 // on whether:
 //  - Derived classes need to know the thread they belong to, as opposed to

ipc/ipc_message_macros.h

@@ -202,7 +202,7 @@
 #include "ipc/ipc_message_utils_impl.h"
 #endif
 
-// Convenience macro for defining structs without inheritence. Should not need
+// Convenience macro for defining structs without inheritance. Should not need
 // to be subsequently redefined.
 #define IPC_STRUCT_BEGIN(struct_name) \
   IPC_STRUCT_BEGIN_WITH_PARENT(struct_name, IPC::NoParams)