improve grammar in comment

Review-Url: https://codereview.chromium.org/2160633002
Cr-Commit-Position: refs/heads/master@{#37844}

src/heap/gc-tracer.cc

@@ -334,7 +334,7 @@ void GCTracer::SampleAllocation(double current_ms,
     return;
   }
   // This assumes that counters are unsigned integers so that the subtraction
-  // below works even if the new counter is less then the old counter.
+  // below works even if the new counter is less than the old counter.
   size_t new_space_allocated_bytes =
       new_space_counter_bytes - new_space_allocation_counter_bytes_;
   size_t old_generation_allocated_bytes =

src/isolate.h

@@ -1173,7 +1173,7 @@ class Isolate {
   // the Isolate. The top of the stack points to a thread which is currently
   // running the Isolate. When the stack is empty, the Isolate is considered
   // not entered by any thread and can be Disposed.
-  // If the same thread enters the Isolate more then once, the entry_count_
+  // If the same thread enters the Isolate more than once, the entry_count_
   // is incremented rather then a new item pushed to the stack.
   class EntryStackItem {
    public:

src/mips/codegen-mips.cc

@@ -41,8 +41,8 @@ MemCopyUint8Function CreateMemCopyUint8Function(Isolate* isolate,
 
     // The size of each prefetch.
     uint32_t pref_chunk = 32;
-    // The maximum size of a prefetch, it must not be less then pref_chunk.
-    // If the real size of a prefetch is greater then max_pref_size and
+    // The maximum size of a prefetch, it must not be less than pref_chunk.
+    // If the real size of a prefetch is greater than max_pref_size and
     // the kPrefHintPrepareForStore hint is used, the code will not work
     // correctly.
     uint32_t max_pref_size = 128;

src/mips64/codegen-mips64.cc

@@ -42,8 +42,8 @@ MemCopyUint8Function CreateMemCopyUint8Function(Isolate* isolate,
 
     // The size of each prefetch.
     uint32_t pref_chunk = 32;
-    // The maximum size of a prefetch, it must not be less then pref_chunk.
-    // If the real size of a prefetch is greater then max_pref_size and
+    // The maximum size of a prefetch, it must not be less than pref_chunk.
+    // If the real size of a prefetch is greater than max_pref_size and
     // the kPrefHintPrepareForStore hint is used, the code will not work
     // correctly.
     uint32_t max_pref_size = 128;

test/mjsunit/unicode-test.js

@@ -5726,7 +5726,7 @@ var source =
 "   All uses of av_ are via get_malloc_state().\n" +
 "   At most one \"call\" to get_malloc_state is made per invocation of\n" +
 "   the public versions of malloc and free, but other routines\n" +
-"   that in turn invoke malloc and/or free may call more then once.\n" +
+"   that in turn invoke malloc and/or free may call more than once.\n" +
 "   Also, it is called in check* routines if DEBUG is set.\n" +
 "*/\n" +
 "\n" +